:root{
  --board:#1F2A24;
  --board-alt:#26332B;
  --board-line:#33413A;
  --chalk:#ECE8DE;
  --chalk-dim:#B9C2B8;
  --yellow:#F2C84B;
  --coral:#E8735A;
  --mint:#7FD9A6;
  --blue:#6FA8DC;
  --lilac:#B79CE8;
  --radius:10px;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--board);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size:34px 34px;
  color:var(--chalk);
  font-family:'Literata', Georgia, serif;
  min-height:100vh;
}
h1,h2,h3,.chalk-font{font-family:'Caveat', cursive;}
.mono{font-family:'JetBrains Mono', monospace;}
a{color:var(--yellow);}
::selection{background:var(--yellow);color:#1F2A24;}

/* Layout */
.app{min-height:100vh;}
.content-col{display:flex;flex-direction:column;min-height:100vh;}

/* --- Narrow layout (phones, tablets in portrait): dropdown nav on top --- */
.topbar{
  background:var(--topbar-bg);
  border-bottom:2px dashed var(--board-line);
  padding:18px 20px;
  position:sticky;top:0;z-index:20;
  backdrop-filter:blur(6px);
}
.topbar-inner{max-width:900px;margin:0 auto;}
.topbar h1{font-size:1.9rem;color:var(--yellow);margin:0 0 1px;line-height:1;display:inline-block;}
.topbar .sub{font-size:.76rem;color:var(--chalk-dim);letter-spacing:.03em;margin-bottom:14px;}
.nav-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;}
.chapter-select{
  flex:1;min-width:220px;
  appearance:none;-webkit-appearance:none;
  background:var(--board-alt) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="%23F2C84B" stroke-width="3"><path d="M6 9l6 6 6-6"/></svg>') no-repeat right 14px center;
  border:1.5px solid var(--board-line);
  color:var(--chalk);
  font-family:'Literata';font-size:1rem;
  padding:11px 40px 11px 14px;
  border-radius:8px;cursor:pointer;
  transition:border-color .15s;
}
.chapter-select:hover, .chapter-select:focus{border-color:var(--yellow);outline:none;}
.chapter-select optgroup{background:var(--board);color:var(--mint);font-family:'JetBrains Mono';font-style:normal;font-size:.78rem;}
.chapter-select option{background:var(--board-alt);color:var(--chalk);font-family:'Literata';padding:6px;}
.topic-meta{
  font-family:'JetBrains Mono';font-size:.78rem;color:var(--chalk-dim);
  margin-top:8px;display:flex;gap:14px;flex-wrap:wrap;
}
/* Mastery-state dots: shape-differentiated, not color-only, so the
   state is legible without relying on color perception. Not started =
   hollow ring. Partial = ring half-filled (conic-gradient, a real half
   circle, not just a lighter shade). Done = fully filled + a small
   checkmark, unambiguous even in grayscale. Same rules apply to
   .topic-meta .dot (topbar summary), .nav-dot (used both in the wide
   sidebar AND the mobile topic-picker sheet -- previously .nav-dot had
   NO base styling at all outside wide layout, so it rendered invisibly
   in the mobile sheet; fixed here). */
.topic-meta .dot, .nav-dot{
  position:relative;width:9px;height:9px;border-radius:50%;
  display:inline-block;flex-shrink:0;margin-right:5px;vertical-align:middle;
  border:1.5px solid var(--chalk-dim);
}
.topic-meta .dot.partial, .nav-dot.partial{
  background:conic-gradient(var(--yellow) 0deg 180deg, transparent 180deg 360deg);
  border-color:var(--yellow);
}
.topic-meta .dot.done, .nav-dot.done{
  background:var(--mint);border-color:var(--mint);
}
.topic-meta .dot.done::after, .nav-dot.done::after{
  content:'\2713';position:absolute;inset:0;display:flex;
  align-items:center;justify-content:center;
  font-size:7px;line-height:1;color:#1F2A24;font-weight:700;
}

/* --- Wide layout (tablet landscape, laptop, desktop): full sidebar ---
   Gated by a JS-managed class (not a raw media query) so switching between
   layouts has a stable buffer zone and cannot flicker back and forth when
   the viewport width sits close to the threshold. See applyLayoutMode(). */
.sidebar{display:none;}

.main{flex:1;width:100%;max-width:900px;margin:0 auto;padding:30px 24px 60px;box-sizing:border-box;}

body.layout-wide .app{display:flex;align-items:flex-start;}
body.layout-wide .topbar{display:none;}
body.layout-wide .sidebar{
  display:block;
  width:290px;flex-shrink:0;
  background:var(--sidebar-bg);
  border-right:2px dashed var(--board-line);
  padding:22px 16px 40px;
  position:sticky;top:0;height:100vh;overflow-y:auto;
  box-sizing:border-box;
}
body.layout-wide .sidebar h1{font-size:2.1rem;color:var(--yellow);margin:0 0 2px;line-height:1;}
body.layout-wide .sidebar .sub{font-size:.8rem;color:var(--chalk-dim);margin-bottom:18px;letter-spacing:.03em;}
body.layout-wide .nav-group-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;color:var(--chalk-dim);margin:18px 4px 8px;}
body.layout-wide .nav-item{
  display:flex;align-items:center;gap:10px;
  padding:9px 10px;margin-bottom:4px;border-radius:var(--radius);
  cursor:pointer;font-size:.92rem;color:var(--chalk);
  border:1px solid transparent;
  transition:background .15s, border-color .15s;
}
body.layout-wide .nav-item:hover{background:rgba(255,255,255,0.05);}
body.layout-wide .nav-item.active{background:rgba(242,200,75,0.14);border-color:rgba(242,200,75,0.4);}
/* .nav-dot base + .done/.partial states now come from the shared rule
   above (shape-differentiated, covers both wide and narrow layouts) --
   no wide-specific override needed here anymore. */
body.layout-wide .nav-badge{
  margin-left:auto;font-family:'JetBrains Mono';font-size:.68rem;
  background:var(--coral);color:#1a1a1a;border-radius:20px;padding:1px 7px;
  font-weight:700;
}
body.layout-wide .nav-special{margin-top:22px;padding-top:14px;border-top:1px dashed var(--board-line);}
body.layout-wide .content-col{flex:1;min-width:0;}
body.layout-wide .main{padding:34px 44px;max-width:920px;}
@media (max-width:600px){
  .topbar{padding:14px 16px;}
  .topbar h1{font-size:1.55rem;}
  .main{padding:20px 16px 50px;}
  .chapter-select{font-size:.92rem;padding:10px 36px 10px 12px;}
}

/* Chalk headings & content blocks */
.eyebrow{font-family:'JetBrains Mono';font-size:.75rem;color:var(--mint);letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px;}
.topic-title{font-size:2.6rem;color:var(--yellow);margin:0 0 18px;line-height:1;}
.notes{font-size:1.05rem;line-height:1.75;color:var(--chalk);}
.notes p{margin:0 0 16px;}
.notes h4{font-family:'Caveat';font-size:1.55rem;color:var(--mint);margin:26px 0 8px;}
.formula-box{
  background:var(--board-alt);border:1px solid var(--board-line);border-left:4px solid var(--blue);
  border-radius:6px;padding:12px 16px;margin:14px 0;font-family:'JetBrains Mono';font-size:.98rem;
  color:var(--blue);overflow-x:auto;
}
.worked{
  background:rgba(127,217,166,0.06);border:1px dashed var(--mint);border-radius:8px;
  padding:14px 18px;margin:16px 0;
}
.worked .label{color:var(--mint);font-family:'JetBrains Mono';font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px;}

/* Buttons */
.btn{
  font-family:'JetBrains Mono';font-size:.85rem;border:1px solid var(--chalk-dim);
  background:transparent;color:var(--chalk);padding:9px 18px;border-radius:6px;
  cursor:pointer;transition:all .15s;
}
.btn:hover{border-color:var(--yellow);color:var(--yellow);}
.btn-primary{background:var(--yellow);color:#1F2A24;border-color:var(--yellow);font-weight:700;}
.btn-primary:hover{background:#ffd96b;color:#1F2A24;}
.btn-row{display:flex;gap:10px;margin-top:26px;flex-wrap:wrap;}

/* Quiz */
.quiz-card{background:var(--board-alt);border:1px solid var(--board-line);border-radius:var(--radius);padding:26px;margin-top:10px;}
.quiz-progress{font-family:'JetBrains Mono';font-size:.8rem;color:var(--chalk-dim);margin-bottom:14px;}
.quiz-q{font-size:1.25rem;line-height:1.5;margin-bottom:20px;}
.opt{
  display:block;width:100%;text-align:left;background:transparent;border:1.5px solid var(--board-line);
  color:var(--chalk);padding:13px 16px;border-radius:8px;margin-bottom:10px;cursor:pointer;
  font-family:'Literata';font-size:1rem;transition:border-color .12s, background .12s;
}
.opt:hover:not(.locked){border-color:var(--blue);}
.opt.correct{border-color:var(--mint);background:rgba(127,217,166,0.14);}
.opt.wrong{border-color:var(--coral);background:rgba(232,115,90,0.14);}
.opt.locked{cursor:default;}
.explain{
  margin-top:18px;background:rgba(111,168,220,0.08);border-left:4px solid var(--blue);
  padding:14px 18px;border-radius:6px;font-size:.98rem;line-height:1.65;
}
.explain .tag{font-family:'JetBrains Mono';font-size:.72rem;color:var(--blue);text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px;}
.score-pill{font-family:'JetBrains Mono';background:var(--board);border:1px solid var(--board-line);border-radius:20px;padding:5px 14px;font-size:.82rem;color:var(--mint);}

/* Flashcard / spaced review */
.flashcard{
  background:var(--board-alt);border:1px solid var(--board-line);border-radius:14px;
  padding:44px 36px;min-height:220px;display:flex;flex-direction:column;justify-content:center;
  text-align:center;margin-top:10px;
}
.flashcard .q{font-size:1.4rem;margin-bottom:14px;}
.flashcard .a{color:var(--mint);font-size:1.1rem;margin-top:14px;padding-top:14px;border-top:1px dashed var(--board-line);}
.rate-row{display:flex;gap:10px;justify-content:center;margin-top:24px;flex-wrap:wrap;}
.rate-btn{flex:1;min-width:110px;max-width:150px;padding:12px 8px;border-radius:8px;border:1px solid var(--board-line);background:transparent;color:var(--chalk);font-family:'JetBrains Mono';font-size:.82rem;cursor:pointer;}
.rate-btn small{display:block;color:var(--chalk-dim);font-size:.7rem;margin-top:3px;}
.rate-again{border-color:var(--coral);} .rate-again:hover{background:rgba(232,115,90,.15);}
.rate-hard{border-color:var(--yellow);} .rate-hard:hover{background:rgba(242,200,75,.15);}
.rate-good{border-color:var(--blue);} .rate-good:hover{background:rgba(111,168,220,.15);}
.rate-easy{border-color:var(--mint);} .rate-easy:hover{background:rgba(127,217,166,.15);}

/* Dashboard */
.dash-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:20px;}
.dash-card{background:var(--board-alt);border:1px solid var(--board-line);border-radius:var(--radius);padding:18px;}
.dash-card .big{font-family:'JetBrains Mono';font-size:2.1rem;color:var(--yellow);}
.dash-card .lbl{font-size:.8rem;color:var(--chalk-dim);}
.topic-row{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--board-line);}
.topic-row .name{flex:1;font-size:.95rem;}
.bar-track{width:120px;height:8px;background:var(--board);border-radius:6px;overflow:hidden;}
.bar-fill{height:100%;background:var(--mint);}

/* Vector Playground */
.playground{display:flex;gap:26px;flex-wrap:wrap;margin-top:16px;}
.pg-controls{flex:1;min-width:260px;background:var(--board-alt);border:1px solid var(--board-line);border-radius:var(--radius);padding:18px;}
.pg-controls label{display:block;font-family:'JetBrains Mono';font-size:.78rem;color:var(--chalk-dim);margin:12px 0 4px;}
.pg-controls input[type=range]{width:100%;accent-color:var(--yellow);}
.pg-readout{font-family:'JetBrains Mono';font-size:.85rem;background:var(--board);border-radius:6px;padding:10px 12px;margin-top:14px;line-height:1.7;}
svg#pgSvg{background:var(--board-alt);border:1px solid var(--board-line);border-radius:var(--radius);width:100%;max-width:400px;height:auto;display:block;margin:0 auto;}

.empty-state{color:var(--chalk-dim);font-style:italic;text-align:center;padding:40px 0;}
.completion-check{color:var(--mint);font-family:'JetBrains Mono';font-size:.85rem;margin-top:16px;}

/* ============================= QUICK-ACCESS TABS + CUSTOM TOPIC PICKER =============================
   Replaces the native <select> as the primary narrow-layout nav: a native
   <select>'s open state is rendered by the OS/browser and cannot be
   restyled, which is why it never matched the rest of the chalk identity.
   Review/Dashboard/Playground are promoted to visible pill tabs so they
   are one tap away instead of buried inside the old dropdown's "More"
   group. The .chapter-select rules above are now unused (no <select> is
   rendered) but left in place -- harmless, and avoids touching anything
   that already works. */
.quick-tabs{display:flex;gap:8px;margin-bottom:10px;flex-wrap:wrap;}
.pill-tab{
  font-family:'JetBrains Mono';font-size:.78rem;
  background:var(--board-alt);border:1px solid var(--board-line);
  color:var(--chalk-dim);padding:10px 16px;border-radius:20px;
  cursor:pointer;transition:all .15s;display:flex;align-items:center;gap:6px;
}
.pill-tab:hover{border-color:var(--yellow);color:var(--chalk);}
.pill-tab.active{background:rgba(242,200,75,0.16);border-color:var(--yellow);color:var(--yellow);}
.pill-badge{
  background:var(--coral);color:#1a1a1a;border-radius:20px;
  font-size:.68rem;font-weight:700;padding:1px 6px;
}

.topic-picker-btn{
  width:100%;display:flex;justify-content:space-between;align-items:center;
  background:var(--board-alt);border:1.5px solid var(--board-line);
  color:var(--chalk);font-family:'Literata';font-size:1rem;
  padding:12px 16px;border-radius:8px;cursor:pointer;
  margin-bottom:10px;transition:border-color .15s;
}
.topic-picker-btn:hover, .topic-picker-btn:focus{border-color:var(--yellow);outline:none;}
.topic-picker-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.topic-picker-chevron{color:var(--yellow);margin-left:10px;flex-shrink:0;}

.topic-sheet{
  position:fixed;inset:0;background:rgba(10,14,12,0.7);
  z-index:50;display:none;align-items:flex-end;justify-content:center;
}
.topic-sheet.open{display:flex;}
.topic-sheet-panel{
  background:var(--board);border-top:2px solid var(--board-line);
  border-radius:16px 16px 0 0;width:100%;max-width:600px;
  max-height:80vh;display:flex;flex-direction:column;
  animation:sheet-up .2s ease-out;
}
@keyframes sheet-up{from{transform:translateY(24px);opacity:0;}to{transform:translateY(0);opacity:1;}}
.topic-sheet-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 20px;border-bottom:1px dashed var(--board-line);flex-shrink:0;
}
.sheet-close{
  background:none;border:1px solid var(--board-line);color:var(--chalk-dim);
  width:40px;height:40px;border-radius:50%;cursor:pointer;font-size:.9rem;
}
.sheet-close:hover{border-color:var(--coral);color:var(--coral);}
.topic-sheet-list{overflow-y:auto;padding:12px 12px 24px;}
.sheet-item{
  display:flex;align-items:center;gap:10px;
  padding:12px 10px;border-radius:8px;cursor:pointer;
  font-size:.98rem;color:var(--chalk);border:1px solid transparent;
}
.sheet-item:hover{background:rgba(255,255,255,0.05);}
.sheet-item.active{background:rgba(242,200,75,0.14);border-color:rgba(242,200,75,0.4);}

@media (min-width:600px){
  .topic-sheet{align-items:center;}
  .topic-sheet-panel{border-radius:14px;max-height:70vh;}
}

/* ============================= WIDE SIDEBAR: quick tabs + footer =============================
   Mirrors the narrow layout's pill tabs so Review/Dashboard/Playground
   are equally reachable in both layouts, instead of sitting after every
   topic where they required scrolling on longer books. */
body.layout-wide .sidebar-quick-tabs{margin:4px 0 20px;}
body.layout-wide .sidebar-footer{
  margin-top:24px;padding-top:14px;border-top:1px dashed var(--board-line);
  display:flex;flex-direction:column;gap:2px;
}
.footer-link{
  background:none;border:none;text-align:left;width:100%;
  color:var(--chalk-dim);font-family:'JetBrains Mono';font-size:.76rem;
  padding:8px 6px;cursor:pointer;border-radius:6px;
}
.footer-link:hover{color:var(--chalk);background:rgba(255,255,255,0.04);}

/* Link back to the platform home page (library.html) from inside a book reader */
.back-link{
  display:inline-block;font-family:'JetBrains Mono';font-size:.75rem;
  color:var(--chalk-dim);text-decoration:none;margin-bottom:10px;
}
.back-link:hover{color:var(--yellow);}

/* Key Takeaways box (from must_remember content) -- previously rendered
   completely unstyled: raw <ul>, no box, no chalk-theme colors. */
.key-takeaways{
  background:rgba(242,200,75,0.06);border:1px dashed var(--yellow);border-radius:8px;
  padding:16px 20px;margin:20px 0;
}
.key-takeaways h4{
  font-family:'JetBrains Mono';font-size:.75rem;color:var(--yellow);
  text-transform:uppercase;letter-spacing:.1em;margin:0 0 10px;
}
.key-takeaways ul{margin:0;padding-left:20px;}
.key-takeaways li{font-size:.96rem;line-height:1.6;margin-bottom:6px;color:var(--chalk);}
.key-takeaways li:last-child{margin-bottom:0;}

/* Modern-Day Relevance section -- uses the --lilac token, previously
   defined but unused anywhere, to give this section a distinct identity
   from the Key Takeaways box (yellow) and worked examples (mint). */
.notes h3{
  font-family:'JetBrains Mono';font-size:.75rem;color:var(--lilac);
  text-transform:uppercase;letter-spacing:.1em;
  margin:28px 0 12px;padding-top:20px;border-top:1px dashed var(--board-line);
}
.notes h3 ~ p strong{color:var(--lilac);}

/* Expandable topic notes below a quiz explanation -- native <details>,
   styled to match the chalk theme instead of default browser chrome. */
.topic-content-expand{
  margin-top:16px;border:1px dashed var(--board-line);border-radius:8px;
  padding:2px 16px;
}
.topic-content-expand summary{
  cursor:pointer;font-family:'JetBrains Mono';font-size:.82rem;
  color:var(--chalk-dim);padding:12px 0;list-style:none;
}
.topic-content-expand summary::-webkit-details-marker{display:none;}
.topic-content-expand summary::before{content:'▸ ';color:var(--yellow);}
.topic-content-expand[open] summary::before{content:'▾ ';}
.topic-content-expand summary:hover{color:var(--chalk);}
.topic-content-expand .notes{padding-bottom:16px;}

/* Book content images -- first book to use these (Respiratory System).
   Notes previously never contained <img> tags at all, so there was no
   existing styling for them or their captions. */
.notes img{
  display:block;max-width:100%;height:auto;margin:20px auto 4px;
  border-radius:8px;border:1px solid var(--board-line);
}
.notes p.figure-caption{
  font-family:'JetBrains Mono';font-size:.82rem;color:var(--chalk-dim);
  text-align:center;margin:0 0 22px;line-height:1.5;
  padding:0 12px;
}

/* Whiteboard theme -- a light counterpart to the default dark
   Blackboard theme. Purely opt-in (see theme-toggle.js); overrides the
   same custom properties every existing rule already uses, so nothing
   else needs to change. */
:root[data-theme="whiteboard"]{
  --board:#FAFAF7;
  --board-line:#B8B2A0;
  --chalk:#1A1A16;
  --chalk-dim:#55524A;
  --yellow:#A67C00;
  --coral:#C74E38;
  --mint:#1F7A4D;
  --sidebar-bg: rgba(0,0,0,0.04);
  --grid-line: rgba(0,0,0,0.06);
  --board-alt: #F0EEE6;
  --blue: #3B7DBF;
  --lilac: #7B5EA7;
  --topbar-bg: rgba(255,255,255,0.75);
}

.theme-toggle-btn{
  position:fixed;
  top:14px;
  right:14px;
  z-index:1000;
  width:40px;
  height:40px;
  border-radius:50%;
  border:1px solid var(--board-line);
  background:var(--board);
  color:var(--chalk);
  font-size:18px;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  box-shadow:0 2px 6px rgba(0,0,0,0.15);
}
.theme-toggle-btn:hover{ border-color:var(--yellow); }

/* Custom confirmation modal -- replaces native browser confirm() popups,
   which look completely out of place against this app's theme and can't
   be styled at all (they also don't respect Whiteboard/Blackboard). */
.confirm-modal-overlay{
  display:none;
  position:fixed;inset:0;
  background:rgba(0,0,0,0.5);
  z-index:2000;
  align-items:center;justify-content:center;
  padding:20px;
}
.confirm-modal-overlay.open{ display:flex; }
.confirm-modal-card{
  background:var(--board);
  border:1px solid var(--board-line);
  border-radius:var(--radius);
  padding:26px;
  max-width:380px;
  width:100%;
  box-shadow:0 12px 40px rgba(0,0,0,0.35);
}
.confirm-modal-msg{
  font-size:1rem;
  color:var(--chalk);
  margin:0 0 22px;
  line-height:1.5;
}
.confirm-modal-actions{
  display:flex;gap:10px;justify-content:flex-end;
}
.confirm-modal-danger{
  background:var(--coral) !important;
  border-color:var(--coral) !important;
  color:#1F2A24 !important;
}
.confirm-modal-danger:hover{ background:#ff8a70 !important; }

/* Quiz question navigator -- jump freely between questions during an
   attempt, exam-style, instead of being locked into strict order. */
.quiz-nav-strip{
  display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px;
}
.quiz-nav-btn{
  width:34px;height:34px;border-radius:6px;
  font-family:'JetBrains Mono';font-size:.8rem;
  border:1.5px solid var(--board-line);background:transparent;color:var(--chalk-dim);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
}
.quiz-nav-btn.current{border-color:var(--yellow);color:var(--yellow);font-weight:700;}
.quiz-nav-btn.correct{background:rgba(127,217,166,0.18);border-color:var(--mint);color:var(--mint);}
.quiz-nav-btn.wrong{background:rgba(232,115,90,0.18);border-color:var(--coral);color:var(--coral);}
.quiz-nav-finish{
  margin-left:auto;
}
.opt.locked{ cursor:default; }
.opt.correct{ border-color:var(--mint) !important; background:rgba(127,217,166,0.1); }
.opt.wrong{ border-color:var(--coral) !important; background:rgba(232,115,90,0.1); }

.notes table{
  width:100%;
  border-collapse:collapse;
  margin:18px 0;
  font-size:.95rem;
}
.notes th, .notes td{
  border:1px solid var(--board-line);
  padding:10px 12px;
  text-align:left;
  vertical-align:top;
}
.notes thead th{
  background:var(--board-alt);
  color:var(--yellow);
  font-family:'JetBrains Mono';
  font-size:.78rem;
  text-transform:uppercase;
  letter-spacing:.05em;
}
.notes tbody tr:nth-child(even){
  background:rgba(255,255,255,0.02);
}
@media (max-width:600px){
  .notes table{ font-size:.85rem; }
  .notes th, .notes td{ padding:8px 8px; }
}