:root{--grain-board: repeating-linear-gradient(24deg, #ffffff06 0 1px, transparent 1px 14px), repeating-linear-gradient(-29deg, #ffffff04 0 1px, transparent 1px 23px)}.player .board{background:var(--grain-board),radial-gradient(58% 30% at 22% 4%,#ffffff08,transparent 70%),radial-gradient(46% 26% at 78% 92%,#e9ddbb07,transparent 75%),radial-gradient(120% 78% at 50% 45%,#1a3a34 0%,var(--slate-mid) 55%,var(--slate-lo) 100%);border:1px solid #ffffff1c;border-bottom:3px solid var(--slate-rail);box-shadow:inset 0 1px #ffffff1a,inset 0 0 0 1px #00000038,inset 0 0 120px #00000059,inset 0 -30px 44px -32px #e9ddbb1a,var(--e-2)}@media(max-width:1023px){.player.m2 .board-wrap>.board{min-height:100%}.player.m2 .board-wrap{padding-bottom:8px}}.player .board-line{color:var(--chalk);text-shadow:0 0 10px #dff3ea1a}.player .board-line .katex{color:var(--chalk)}.player .text-line{color:#e2efe9}.player .board>.text-line:first-child{color:#f7edd4;text-shadow:0 0 14px #f5e4b626;background:linear-gradient(90deg,transparent,#e9d9ae4d 14%,#e9d9ae66 50%,#e9d9ae4d 86%,transparent) no-repeat left bottom / 100% 2px}.player .board>.board-line:not(.text-line):not(.table-line):not(.sketch-line){background:linear-gradient(180deg,#ffffff09,#ffffff04);border:1px solid #ffffff12;border-radius:var(--r-sm)}.player .board-line.active{background:linear-gradient(180deg,#f5b8421f,#f5b84210);border-left-color:#f5b842d9;box-shadow:0 0 26px #f5b84212,inset 0 0 20px #f5b8420d}.player .board-line.dimmed{opacity:.42}.player .board-line .katex-display{overflow-x:auto;overflow-y:hidden;padding:6px 0 8px;scrollbar-width:thin;scrollbar-color:#ffffff26 transparent;overscroll-behavior-x:contain}.player .board-line .katex-display::-webkit-scrollbar{height:6px}.player .board-line .katex-display::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:6px}.player .stepmap{gap:var(--sp-2);align-items:center}.player .stepmap-track{height:8px;gap:4px}.player .stepmap-seg{border-radius:var(--r-pill);background:#ffffff0f;box-shadow:inset 0 1px 1px #00000038}.player .stepmap-seg.done{background:linear-gradient(90deg,#34d39947,#34d39966);box-shadow:none}.player .stepmap-seg.current{background:var(--gold-grad);box-shadow:0 0 10px #f5b84259,inset 0 1px #ffffff40}.player .stepmap-label{display:inline-flex;align-items:center;gap:5px;font-size:var(--fs-xs);font-weight:var(--w-mid);color:var(--ink-2);max-width:52%}.player .counter{font-variant-numeric:tabular-nums;letter-spacing:.02em}.player>.progress{height:4px;background:#ffffff0d;border-radius:var(--r-pill)}.player>.progress .bar{box-shadow:0 0 12px #f5b84247}.player.growing>.progress .bar{background:repeating-linear-gradient(115deg,var(--gold) 0 10px,var(--gold-deep) 10px 20px);opacity:.85}.player.growing>.progress{box-shadow:inset 0 0 0 1px var(--gold-a20)}.player.growing .counter:after{content:"+";color:var(--gold-soft)}.player.growing .stepmap-track:after{content:"";flex:0 0 18px;align-self:stretch;border-radius:var(--r-pill);background:repeating-linear-gradient(115deg,#ffffff14 0 4px,transparent 4px 8px)}.player .voicebox>*{flex-shrink:0}.player .subtitle{background:linear-gradient(180deg,#ffffff10,#ffffff07);border:1px solid var(--line-2);box-shadow:var(--e-1),var(--rim-soft);line-height:1.95}.player .subtitle .prose-math .katex{color:#fbd38d}.player .checkpoint{background:radial-gradient(120% 100% at 80% -20%,#f5b84216,transparent 60%),linear-gradient(180deg,#ffffff0a,#ffffff04);border:1px solid var(--gold-a45);border-radius:var(--r-lg);box-shadow:var(--e-2),inset 0 1px #ffffff14,0 0 0 4px #f5b8420a}.player .checkpoint .try-label{display:inline-flex;align-items:center;gap:5px;margin-bottom:var(--sp-2);padding:3px 10px;border-radius:var(--r-pill);background:var(--gold-a20);border:1px solid var(--gold-a45);color:var(--gold-hi);font-size:var(--fs-xs);font-weight:var(--w-bold);letter-spacing:.02em}.player .checkpoint .question{line-height:1.95;font-size:var(--fs-base)}.player .checkpoint.drill{border-color:#c4b5fd66}.player .checkpoint.drill .try-label{background:#c4b5fd1f;border-color:#c4b5fd59;color:#ddd6fe}.player .askbox{border-color:#7dd3fc44;box-shadow:var(--e-1),var(--rim-soft)}.player .askbox .try-label{background:#7dd3fc1a;border-color:#7dd3fc4d;color:#bae6fd}.player .cp-option{background:linear-gradient(180deg,#ffffff0e,#ffffff06),#1b2740;border:1px solid #ffffff2b;box-shadow:var(--rim-soft);line-height:1.85}.player .cp-option:before{width:15px;height:15px;border-width:2px}.player .cp-option:active{box-shadow:var(--e-press)}.player .thinking{background:linear-gradient(180deg,#ffffff0b,#ffffff05);border:1px solid var(--line-2);border-radius:var(--r-md);color:#c6d3e6;box-shadow:var(--rim-soft)}.player .thinking .dots i{background:var(--gold-soft)}.player .controls .round:not(.primary){background:linear-gradient(180deg,#ffffff12,#ffffff08);border:1px solid var(--line-2);box-shadow:var(--e-1),var(--rim-soft);color:var(--ink-1)}@media(hover:hover){.player .controls .round:not(.primary):hover{border-color:var(--line-3);background:#ffffff17}}.player .controls .primary.round{border:1px solid #ffffff33;box-shadow:var(--e-1),var(--glow-gold),inset 0 1px #ffffff59}.player .controls .seek{border-color:#ffffff2a;color:#f7edd4}.player .controls .seek:active{transform:scale(.96);box-shadow:var(--e-press)}.player .controls .pill{background:linear-gradient(180deg,#ffffff0d,#ffffff06);border:1px solid var(--line-2);box-shadow:var(--rim-soft);color:var(--ink-2)}.player .controls .pill.active{border-color:var(--sem-recall);color:#bae6fd;background:#7dd3fc14}.player~.finished .card,.finished .card{background:radial-gradient(120% 90% at 50% -10%,#f5b84214,transparent 60%),linear-gradient(180deg,#16213a,#0e1626);box-shadow:var(--e-3),var(--rim)}.finished .card.partial{background:var(--grain-board),radial-gradient(120% 90% at 50% -10%,#1d3d3666,transparent 62%),linear-gradient(180deg,#15251f,#0e1a17);border-color:var(--slate-line)}.finished .card.partial .big{background:radial-gradient(120% 120% at 30% 20%,#e9ddbb1f,transparent 70%);border-color:#d9c9a340;box-shadow:0 0 0 8px #e9ddbb08,0 0 34px #0000004d}.finished .card.partial h2{color:#f2f8f5}.finished .card.partial .fin-sum{color:var(--chalk-2);max-width:34ch;line-height:var(--lh-body)}@media(prefers-reduced-motion:reduce){.player.growing>.progress .bar{background:var(--gold-deep)}}