:root{--bg: #0f1115;--panel: #181b22;--panel-2: #1f232c;--ink: #e8eaf0;--muted: #99a0ad;--line: #2a2f3a;--accent: #5b8def;--accent-2: #8b6cf0;--warn: #f0a35b;--good: #4fbf8b;--bad: #e5685f;--radius: 12px;--maxw: 760px;font-synthesis:none;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:baseline;gap:14px;padding:14px 20px;border-bottom:1px solid var(--line);background:#0f1115e6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0;z-index:20}.brand{font-weight:700;font-size:1.15rem;letter-spacing:-.01em}.brand-mark{margin-right:4px}.brand-sub{color:var(--muted);font-size:.85rem}.hamburger{display:none;background:none;border:none;color:var(--ink);font-size:1.3rem;cursor:pointer}.layout{display:flex;flex:1;min-height:0}.sidebar{width:280px;flex-shrink:0;border-right:1px solid var(--line);overflow-y:auto;padding:16px 12px;background:var(--bg)}.nav-list{list-style:none;margin:0;padding:0}.nav-item{display:grid;grid-template-columns:24px 1fr auto;align-items:center;gap:8px;width:100%;text-align:left;background:none;border:none;color:var(--muted);padding:9px 10px;border-radius:9px;cursor:pointer;font-size:.92rem}.nav-item:hover{background:var(--panel);color:var(--ink)}.nav-item.active{background:var(--panel-2);color:var(--ink)}.nav-num{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:var(--panel);font-size:.78rem;font-weight:600}.nav-item.active .nav-num{background:var(--accent);color:#fff}.nav-text{line-height:1.25}.nav-tag{font-size:.65rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);opacity:.7}.nav-foot{margin:18px 10px 8px;font-size:.78rem;color:var(--muted);line-height:1.5}.content{flex:1;overflow-y:auto}.lesson{max-width:var(--maxw);margin:0 auto;padding:32px 22px 80px}.lesson-head{margin-bottom:8px}.lesson-kicker{text-transform:uppercase;letter-spacing:.08em;font-size:.72rem;color:var(--accent);font-weight:600}.lesson h1{font-size:1.9rem;margin:6px 0 18px;letter-spacing:-.02em}.lesson h3{margin-top:30px;font-size:1.2rem}.lesson h4{margin:4px 0 8px;font-size:1rem;color:var(--ink)}.lead{font-size:1.08rem;color:#cdd2dc}.muted{color:var(--muted);font-size:.9rem}.warn-text{color:var(--warn)}code{background:var(--panel-2);padding:1px 6px;border-radius:5px;font-size:.86em}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin:20px 0}.btn-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:6px 0 12px}.btn{background:var(--accent);color:#fff;border:none;padding:8px 14px;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;transition:filter .12s ease}.btn:hover{filter:brightness(1.08)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-ghost{background:var(--panel-2);color:var(--ink)}.btn-on{background:var(--accent-2)}.btn.btn-on{box-shadow:0 0 0 2px #8b6cf066}.slider-row{display:flex;flex-direction:column;gap:4px;margin:10px 0;font-size:.92rem}.slider-row input[type=range]{width:100%;accent-color:var(--accent)}.result{margin-top:12px;padding:10px 12px;background:var(--panel-2);border-radius:8px;display:flex;flex-wrap:wrap;align-items:center;gap:10px}.chart{width:100%;height:auto;display:block;margin:6px 0;max-height:340px}.bar{fill:var(--accent)}.bar-hi{fill:var(--accent-2)}.chart-label{fill:var(--muted);font-size:3px}.chart-value{fill:var(--ink);font-size:2.4px}.ref-line{stroke:var(--muted);stroke-dasharray:3 3;stroke-width:1;opacity:.6}.chart-block{margin:16px 0}.coin-strip{display:flex;flex-wrap:wrap;gap:4px;margin:10px 0;min-height:28px}.coin{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;font-size:.75rem;font-weight:700}.coin.h{background:#5b8def38;color:var(--accent)}.coin.t{background:#f0a35b2e;color:var(--warn)}.doors{display:flex;gap:12px;justify-content:center;margin:8px 0 14px}.door{flex:1;max-width:130px;aspect-ratio:3 / 4;border:2px solid var(--line);border-radius:10px;background:var(--panel-2);color:var(--ink);cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;transition:transform .1s ease,border-color .1s ease}.door:not(:disabled):hover{transform:translateY(-3px);border-color:var(--accent)}.door-num{font-size:.78rem;color:var(--muted)}.door-face{font-size:2rem}.door-tag{font-size:.66rem;padding:2px 6px;border-radius:99px;background:var(--panel);color:var(--muted)}.door-picked{border-color:var(--accent)}.door-openEmpty{opacity:.55}.door-prize{border-color:var(--good)}.door-pickedEmpty{border-color:var(--bad)}.big-stat{margin:14px 0;text-align:center;font-size:.95rem;color:var(--muted)}.big-num{display:block;font-size:2.6rem;font-weight:800;color:var(--accent);letter-spacing:-.02em}.freq-grid ul{margin:6px 0;padding-left:18px}.freq-grid li{margin:4px 0;font-size:.92rem}.formula{background:var(--panel-2);border:1px solid var(--line);border-left:3px solid var(--accent-2);border-radius:8px;padding:14px 16px;margin:16px 0;font-size:.95rem;line-height:1.7}.turkey-stage{display:flex;gap:16px;align-items:center}.turkey{font-size:3.2rem}.takeaway{border-left:3px solid var(--good);background:#4fbf8b12;border-radius:0 8px 8px 0;padding:12px 16px;margin:22px 0}.takeaway-title{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--good);font-weight:700;margin-bottom:4px}.takeaway-body{font-size:.95rem}.quiz{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin:24px 0}.quiz-q{margin:0 0 12px;font-weight:600}.quiz-tag{display:inline-block;font-size:.66rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-2);background:#8b6cf01f;padding:2px 8px;border-radius:99px;margin-right:8px;font-weight:700}.quiz-options{display:flex;flex-direction:column;gap:8px}.quiz-opt{text-align:left;background:var(--panel-2);border:1px solid var(--line);color:var(--ink);padding:10px 12px;border-radius:8px;cursor:pointer;font-size:.92rem}.quiz-opt:not(:disabled):hover{border-color:var(--accent)}.quiz-opt.correct{border-color:var(--good);background:#4fbf8b1f}.quiz-opt.wrong{border-color:var(--bad);background:#e5685f1f}.quiz-explain{margin-top:12px;padding:10px 12px;background:var(--panel-2);border-radius:8px;font-size:.9rem}.pager{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:40px;padding-top:20px;border-top:1px solid var(--line)}.credit{margin-top:30px;font-size:.78rem;opacity:.7}@media (max-width: 820px){.hamburger{display:block}.brand-sub{display:none}.sidebar{position:fixed;top:53px;bottom:0;left:0;transform:translate(-100%);transition:transform .2s ease;z-index:15;box-shadow:0 0 40px #00000080}.sidebar.open{transform:translate(0)}.lesson{padding:22px 16px 70px}.lesson h1{font-size:1.55rem}}