/* Interactive rotation playground — split view */
.play-section{background:var(--bg)}
.play-inner{padding-top:0 !important}
.play-root{margin-top:22px;position:relative}
.play-card{background:transparent;padding:0;position:relative}
.query-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.query-row .query-bar{flex-shrink:0;margin-bottom:0}
.query-row .chips{display:flex;flex-wrap:wrap;gap:6px;margin:0}
.demo-zone{border:1px solid var(--border-2);border-radius:0 var(--rl) var(--rl) var(--rl);background:var(--surface);padding:16px;box-shadow:0 12px 32px rgba(0,0,0,.22)}
.play-svg .cand{cursor:pointer}
.play-svg .cand:hover circle{stroke-width:2.5;filter:brightness(1.3)}

/* Tooltip */
.cand-tip{position:absolute;z-index:50;width:280px;max-width:92%;background:var(--bg);border:1px solid var(--border-2);border-radius:10px;padding:12px 13px;box-shadow:0 18px 48px rgba(0,0,0,.55);pointer-events:none;font:400 12px/1.45 var(--sans);color:var(--text-2);animation:tt-in .14s ease-out}
@keyframes tt-in{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.cand-tip.tt-flat{border-color:rgba(248,113,113,.4)}
.cand-tip.tt-graph{border-color:var(--cyan-border)}
.tt-head{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.tt-id{font:700 11px var(--mono);background:var(--surface-2);border-radius:4px;padding:3px 7px;color:var(--text-2)}
.tt-graph .tt-id{background:var(--cyan-border);color:var(--cyan)}
.tt-flat .tt-id{background:var(--bad-border);color:var(--bad)}
.tt-title{font:600 12px var(--sans);color:var(--text)}
.tt-pills{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:9px;align-items:center}
.tt-pill{font:600 9px var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:3px 7px;border-radius:999px;color:var(--pc,var(--text-3));border:1px solid color-mix(in srgb, var(--pc, var(--text-3)) 40%, transparent);background:color-mix(in srgb, var(--pc, var(--text-3)) 8%, transparent)}
.tt-type{--pc:var(--text-3)}
.tt-date{font:500 10px var(--mono);color:var(--text-3);margin-left:auto}
.tt-bars{margin:0 0 8px}
.tt-bar-row{display:flex;align-items:center;gap:8px;padding:3px 0;border-bottom:1px solid var(--hover-1)}
.tt-bar-row:last-child{border-bottom:none}
.tt-bar-label{font:500 11px var(--sans);color:var(--text-2);width:108px;flex-shrink:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:5px}
.tt-bar-track{flex:1;height:5px;background:var(--border);border-radius:3px;position:relative;overflow:hidden}
.tt-bar-full .tt-bar-fill{position:absolute;left:0;top:0;height:100%;border-radius:3px}
.tt-bar-center::after{content:'';position:absolute;left:50%;top:0;width:1px;height:100%;background:rgba(255,255,255,.18)}
.tt-bar-pos{position:absolute;left:50%;top:0;height:100%;border-radius:0 3px 3px 0}
.tt-bar-neg{position:absolute;right:50%;top:0;height:100%;border-radius:3px 0 0 3px}
.tt-bar-total{padding-top:6px !important;margin-top:3px;border-top:1px solid var(--border) !important}
.tt-bar-total .tt-bar-label{font-weight:700;color:var(--text)}
.tt-dot{display:inline-block;width:6px;height:6px;border-radius:50%;margin-right:6px;vertical-align:middle}
.tt-why{font:400 11px/1.5 var(--sans);color:var(--text-3);padding-top:8px;border-top:1px solid var(--border)}
.play-head{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:14px;flex-wrap:wrap}
.play-sub{font:700 10px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--text-3)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;align-items:center;gap:7px;padding:6px 12px 6px 10px;background:transparent;border:1px solid var(--border-2);border-radius:999px;cursor:pointer;transition:all .18s;color:var(--text-2)}
.chip:hover{border-color:var(--c);color:var(--text)}
.chip .chip-dot{width:7px;height:7px;border-radius:50%;background:var(--c);opacity:.35;transition:all .18s}
.chip .chip-name{font:500 12px var(--sans)}
.chip.chip-on{border-color:var(--c);background:color-mix(in srgb, var(--c) 14%, transparent);color:var(--c)}
.chip.chip-on .chip-dot{opacity:1;box-shadow:0 0 8px var(--c)}
.chip.chip-on .chip-name{font-weight:600}

.play-split{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width: 760px){.play-split{grid-template-columns:1fr}}
.play-panel{border:1px solid var(--border);border-radius:12px;padding:8px;background:linear-gradient(180deg,var(--surface),var(--surface-2));display:flex;flex-direction:column;gap:6px}
.play-panel.p-off{border-color:var(--bad-border)}
.play-panel.p-on{border-color:var(--cyan-border)}
.pn-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.pn-side{font:600 10px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--text-3)}
.play-sub-warn{color:#f59e0b !important}
.pn-badge{font:700 10px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;padding:6px 10px;border-radius:999px;border:1px solid transparent}
.pn-flat{color:var(--bad);border-color:var(--bad-border);background:var(--bad-bg)}
.pn-graph{color:var(--cyan);border-color:var(--cyan-border);background:var(--cyan-bg-2)}
.play-svg{width:100%;height:auto;border-radius:8px}
.play-svg .qline{stroke:rgba(139,149,167,.3);stroke-width:1;stroke-dasharray:3 4;transition:all .55s cubic-bezier(.4,0,.2,1)}
.p-off .play-svg .qline-win{stroke:var(--bad);stroke-width:2;stroke-dasharray:none;filter:drop-shadow(0 0 6px var(--bad-border))}
.p-on .play-svg .qline-win{stroke:var(--cyan);stroke-width:2;stroke-dasharray:none;filter:drop-shadow(0 0 6px var(--cyan-border))}
.play-svg .qnode circle{fill:var(--bad-border);stroke:var(--bad);stroke-width:2}
.play-svg .qnode-on circle{fill:var(--blue-border);stroke:var(--blue)}
.play-svg .qnode text{font:700 12px var(--mono);fill:#fff;text-anchor:middle}
.play-svg .qnode .qnode-label{font:500 9px var(--sans,sans-serif);fill:rgba(255,255,255,.55);letter-spacing:.04em;text-transform:uppercase}
.play-svg .cand{transition:transform .6s cubic-bezier(.4,0,.2,1)}
.play-svg .cand circle{fill:#1a1c22;stroke:var(--text-3);stroke-width:1.5;transition:all .4s}
.play-svg .cand .cand-id{font:700 11px var(--mono);fill:#cbd5e1;text-anchor:middle}
.p-off .play-svg .cand-win circle{fill:var(--bad-border);stroke:var(--bad);stroke-width:2.5;filter:drop-shadow(0 0 8px var(--bad-border))}
.p-off .play-svg .cand-win .cand-id{fill:var(--bad)}
.p-on .play-svg .cand-win circle{fill:var(--cyan-bg-2);stroke:var(--cyan);stroke-width:2.5;filter:drop-shadow(0 0 8px var(--cyan-border))}
.p-on .play-svg .cand-win .cand-id{fill:var(--cyan)}

.pn-top{display:grid;grid-template-columns:auto 24px 1fr;align-items:center;gap:6px;padding:5px 8px;border-radius:6px;background:var(--hover-1);border:1px solid var(--border)}
.pn-rank{font:700 9px var(--mono);letter-spacing:.16em;color:var(--text-3)}
.pn-id{font:700 11px var(--mono);background:var(--surface-2);border-radius:4px;text-align:center;padding:2px 0;color:var(--text-2)}
.pn-lbl{font:500 12px var(--sans);color:var(--text-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.p-off .pn-top{border-color:var(--bad-border);background:var(--bad-bg)}
.p-off .pn-id,.p-off .pn-lbl{color:var(--bad-text)}
.p-on .pn-top{border-color:var(--cyan-border);background:var(--cyan-bg-1)}
.p-on .pn-id,.p-on .pn-lbl{color:var(--cyan)}

/* Vertical tabs */
/* Tab strip — sits above the demo-zone like a sticky-note pile */
.vt-tabstrip{display:flex;align-items:flex-end;gap:4px;padding:0;margin:0 0 -1px;position:relative;z-index:2}
.vt-tab{display:inline-flex;align-items:center;gap:8px;font:600 13px var(--sans);color:var(--text-3);background:transparent;border:1px solid transparent;border-bottom:0;padding:9px 16px 10px;border-radius:10px 10px 0 0;cursor:pointer;transition:color .15s,background .15s;position:relative}
.vt-tab:hover{color:var(--text-2);background:var(--hover-1)}
.vt-tab .vt-ico{display:inline-flex;align-items:center;color:var(--text-3);opacity:.85;transition:color .15s,opacity .15s}
.vt-tab .vt-lbl{letter-spacing:.01em}
.vt-tab-on{color:var(--text);background:var(--surface);border-color:var(--border-2);padding-bottom:11px;z-index:1}
.vt-tab-on::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--surface)}
.vt-tab-on .vt-ico{color:var(--cyan);opacity:1}
.vt-note{font:400 13px/1.55 var(--sans);color:var(--text-2);margin:12px 0 0;padding:10px 14px;background:linear-gradient(90deg,var(--cyan-bg-1),transparent 70%);border-left:2px solid var(--cyan-border);border-radius:0 6px 6px 0}
.vt-note b{color:var(--text);font-weight:600}

/* Single panel — full width */
.play-single { display:block!important; grid-template-columns:1fr!important; }
.play-single .play-panel { max-width:100%!important; }

/* Dual layout: list + graph side by side */
.play-dual { display:grid !important; grid-template-columns: 1fr 1.2fr !important; gap:16px; }
.rk-panel { display:flex; flex-direction:column; min-height:0; }
.rk-list-inner { display:flex; flex-direction:column; gap:0; flex:1; padding:8px; overflow:hidden; }
.rk-row { display:grid; grid-template-columns:24px 38px 1fr 44px; gap:8px; align-items:center; padding:8px 10px; border-radius:8px; font-size:12px; transition:all .35s ease; }
.rk-row + .rk-row { margin-top:2px; }
.rk-pos { font-weight:700; color:var(--text-3); font-size:11px; text-align:center; }
.rk-id  { font-family:ui-monospace,monospace; font-size:11px; color:var(--text-2); background:var(--hover-1); padding:2px 6px; border-radius:4px; text-align:center; }
.rk-lbl { color:var(--text-2); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.rk-score { font-family:ui-monospace,monospace; font-size:11px; color:var(--text-3); text-align:right; }
.rk-top  { background:var(--cyan-bg-1); border:1px solid var(--cyan-border); }
.rk-top .rk-pos { color:var(--cyan); }
.rk-top .rk-lbl { color:var(--text); font-weight:500; }
.rk-top .rk-score { color:var(--cyan); font-weight:600; }
.rk-dim { opacity:.5; }

/* Stacked panel head with query underneath */
.pn-head-stack { flex-direction:column !important; align-items:stretch !important; gap:8px !important; }
.pn-head-row { display:flex; justify-content:space-between; align-items:center; gap:12px; }
.pn-query { font-size:13px; color:var(--text-2); font-style:italic; }

/* Signals row (no query bar) */
.signals-row { display:flex; flex-direction:column; gap:10px; margin-bottom:14px; }
.signals-label { font-size:11px; text-transform:uppercase; letter-spacing:.08em; color:var(--text-2); font-weight:600; }

/* Make single list panel use full width */
.play-single .rk-panel { width:100%; }

/* === Signals callout (left column, instructive) === */
.sig-callout { margin-top:24px; padding:18px 18px 16px; border:1px solid var(--cyan-bg-2); border-radius:12px; background:linear-gradient(180deg,var(--cyan-bg-1),rgba(45,212,191,.01)); }
.sig-callout-label { display:flex; align-items:center; gap:8px; font-size:11px; text-transform:uppercase; letter-spacing:.08em; font-weight:700; color:var(--cyan); margin-bottom:12px; }
.sig-callout-arrow { font-size:14px; animation: nudge 2s ease-in-out infinite; }
@keyframes nudge { 0%,100%{transform:translateX(0)} 50%{transform:translateX(3px)} }
.sig-callout-chips { display:flex; flex-wrap:wrap; gap:6px; margin-bottom:10px; }
.sig-callout-hint { font-size:12px; color:var(--text-2); line-height:1.5; }

/* === Toggle-style signal buttons === */
.sig-btn { display:inline-flex; align-items:center; gap:8px; padding:6px 12px 6px 8px; border:1px solid var(--border-2); background:var(--hover-1); border-radius:99px; color:#aaa; font-size:12px; font-weight:500; cursor:pointer; transition:all .18s ease; font-family:inherit; }
.sig-btn:hover { border-color:var(--border-2); background:var(--hover-2); color:var(--text); transform:translateY(-1px); }
.sig-btn-toggle { width:22px; height:14px; border-radius:99px; background:var(--border-2); position:relative; transition:all .2s ease; flex-shrink:0; }
.sig-btn-dot { position:absolute; top:2px; left:2px; width:10px; height:10px; border-radius:50%; background:var(--text-3); transition:all .2s ease; }
.sig-btn-on { border-color:var(--c); background:color-mix(in srgb, var(--c) 12%, transparent); color:var(--text); }
.sig-btn-on .sig-btn-toggle { background:color-mix(in srgb, var(--c) 35%, transparent); }
.sig-btn-on .sig-btn-dot { left:10px; background:var(--c); box-shadow:0 0 8px var(--c); }

/* Horizontal vertical-tabs at top of demo panel */
.vt-tabstrip-horiz { display:flex !important; flex-direction:row !important; gap:6px; margin-bottom:14px; padding:0; border:none; background:none; }
.vt-tabstrip-horiz .vt-tab { flex:1; justify-content:center; padding:8px 12px; border:1px solid var(--border); border-radius:8px; background:var(--hover-1); }
.vt-tabstrip-horiz .vt-tab:hover { background:var(--hover-2); }
.vt-tabstrip-horiz .vt-tab-on { background:var(--cyan-bg-2); border-color:var(--cyan-border); color:var(--text); }
.vt-tabstrip-horiz .vt-tab-on::after { display:none; }
.vt-tabstrip-horiz .vt-tab-on .vt-ico { color:var(--cyan); opacity:1; }

/* Tighter demo zone (no internal padding wrappers) */
.demo-zone-tight { padding:0 !important; background:none !important; border:none !important; }
.demo-zone-tight .play-split { margin:0; }

/* === Solution-section bullets (left column) === */
.sol-bullets { list-style:none; padding:0; margin:24px 0 20px; display:flex; flex-direction:column; gap:14px; }
.sol-bullets li { display:flex; gap:12px; align-items:flex-start; font-size:14px; line-height:1.55; color:var(--text-2); }
.sol-bullets li strong { color:var(--text); font-weight:600; }
.sol-bullet-dot { width:8px; height:8px; border-radius:50%; flex-shrink:0; margin-top:7px; box-shadow:0 0 8px currentColor; }
.sol-tryit { font-size:13px; color:var(--cyan); margin:18px 0 0; padding:10px 14px; background:var(--cyan-bg-1); border-left:2px solid var(--cyan); border-radius:0 6px 6px 0; }
.sol-tryit strong { color:var(--text); font-weight:600; }

/* === Inline play controls (inside demo panel) === */
.play-controls { padding:6px 10px; border:1px solid var(--border); border-radius:8px; background:var(--hover-1); margin-bottom:12px; display:flex; align-items:center; gap:10px; flex-wrap:nowrap; }
.play-controls-below { margin-bottom:0; margin-top:10px; }
.play-controls-label { font-size:10px; text-transform:uppercase; letter-spacing:.06em; font-weight:700; color:var(--text-2); display:flex; align-items:center; gap:5px; white-space:nowrap; flex-shrink:0; }
.play-controls-arrow { color:var(--cyan); animation: nudgeDown 1.6s ease-in-out infinite; }
@keyframes nudgeDown { 0%,100%{transform:translateY(0)} 50%{transform:translateY(2px)} }
.play-controls-chips { display:flex; flex-wrap:nowrap; gap:4px; flex:1; justify-content:flex-end; min-width:0; }
.play-controls .sig-btn { padding:2px 7px 2px 5px; font-size:10.5px; gap:5px; }
.play-controls .sig-btn-toggle { width:16px; height:10px; }
.play-controls .sig-btn-dot { width:6px; height:6px; top:2px; left:2px; }
.play-controls .sig-btn-on .sig-btn-dot { left:8px; }
@media (max-width: 720px){
  .play-controls { flex-wrap:wrap; }
  .play-controls-chips { flex-wrap:wrap; justify-content:flex-start; }
}

/* === sect-a problem panel — uses rk-panel style + extras === */
.rk-warn { color:var(--bad); font-size:11px; font-weight:500; margin-left:6px; }
.rk-good { color:var(--cyan); font-size:11px; font-weight:500; margin-left:6px; }
.rk-bad { background:var(--bad-bg); border:1px solid var(--bad-border); }
.rk-bad .rk-pos { color:var(--bad); }
.rk-bad .rk-lbl { color:var(--text); }
.rk-bad .rk-score { color:var(--bad); font-weight:600; }
.rk-buried { background:var(--cyan-bg-1); border:1px solid var(--cyan-border); opacity:.75; }
.rk-buried .rk-pos { color:var(--cyan); }
.rk-buried .rk-lbl { color:var(--text-2); }
.rk-buried .rk-score { color:var(--cyan); font-weight:600; }
.rk-divider { padding:8px 10px; font-size:10px; text-transform:uppercase; letter-spacing:.1em; color:var(--text-3); text-align:center; font-family:ui-monospace,monospace; margin:2px 0; }