:root{color-scheme:dark;--bg:#10192d;--panel:#17243d;--inset:#121d35;--text:#eaf0fc;--muted:#9cadc7;--line:#31415b;--accent:#5de0c4;--ink:#0c302c;--error:#ff9fad;--shadow:0 15px 50px #050b1720;font-family:'Malgun Gothic','Apple SD Gothic Neo',system-ui,sans-serif;font-size:15px;line-height:1.6}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}[data-theme=light]{color-scheme:light;--bg:#f0f4fa;--panel:#fff;--inset:#f7f9fc;--text:#17243d;--muted:#52617b;--line:#d4dce8;--accent:#087c69;--ink:#fff;--error:#ae253b}button,input,textarea,select{font:inherit}button,a,input,select,textarea{ -webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:9px;padding:9px 14px;min-height:44px;transition:background .15s}button:hover{background:var(--line)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:3px}input,select,textarea{display:block;width:100%;min-width:0;max-width:100%;background:var(--inset);color:var(--text);border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-height:44px}textarea{resize:vertical}label{display:block;font-size:.87rem;color:var(--muted)}label>input,label>textarea,label>select{margin-top:6px}code,.syntax{font-family:Consolas,'Courier New',monospace;overflow-wrap:anywhere}header{max-width:1200px;padding:25px 32px;display:flex;justify-content:space-between;align-items:center;margin:auto;gap:12px}.brand{display:flex;gap:11px;text-decoration:none;color:var(--text);align-items:center;font-size:1.4rem;font-weight:750;letter-spacing:-.05em}.brand small{display:block;color:var(--muted);font-weight:400;font-size:.7rem;letter-spacing:.01em}.brand-mark{display:grid;place-items:center;width:43px;height:43px;background:var(--accent);color:var(--ink);border-radius:14px 14px 4px 14px;font-size:2.4rem;line-height:1}.header-tools{display:flex;align-items:center;gap:18px}.study-label{font-size:.8rem;color:var(--muted)}#theme{font-size:1.25rem;width:44px;padding:4px}nav{display:flex;max-width:1136px;margin:auto;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:thin}nav button{border:0;background:none;border-radius:0;padding:15px 28px;white-space:nowrap;color:var(--muted);font-weight:600}nav button[aria-current]{color:var(--accent);box-shadow:inset 0 -3px var(--accent)}main{max-width:1200px;margin:auto;padding:42px 32px 70px}h1{font-size:2.65rem;line-height:1.3;letter-spacing:-.07em;margin:0 0 12px;font-weight:700}h2{font-size:1rem;margin:0 0 14px;font-weight:650}p{margin:0 0 16px}p,small{overflow-wrap:anywhere}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:30px}.section-heading p{color:var(--muted);font-size:.95rem;margin-bottom:0}.mode-label{width:130px;flex-shrink:0}.workspace{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(0,1fr);gap:24px}.workspace>*{min-width:0}.expression-panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:22px 24px}.expression-panel>label{font-weight:600}.expression-panel textarea{font-family:Consolas,'Courier New',monospace;font-size:1.45rem;background:none;border:0;padding:16px 0;line-height:1.6;min-height:125px;outline-offset:4px}.expression-bottom{display:flex;gap:15px;align-items:center;justify-content:space-between;padding:12px 0 20px}.expression-bottom>span{font-size:.73rem;color:var(--muted)}button.primary{background:var(--accent);border-color:var(--accent);color:var(--ink);font-weight:700;white-space:nowrap}.primary:hover{filter:brightness(1.08)}.result-box{border-top:1px solid var(--line);padding-top:17px}.result-box>span{color:var(--muted);font-size:.8rem}.result-box output{display:block;text-align:right;font-family:Consolas,monospace;font-size:2.6rem;line-height:1.4;color:var(--accent);overflow-wrap:anywhere;margin-top:10px}.error{color:var(--error);font-size:.85rem;margin:10px 0 0;white-space:pre-wrap}.error:empty{display:none}.quick-insert{display:flex;flex-wrap:wrap;gap:7px;margin:15px 0 26px}.quick-insert button{font-size:.85rem;background:transparent;padding:6px 11px;min-height:39px}.saved-vars{padding:3px 4px}.saved-vars>div{font-size:.85rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:9px}.history-panel{padding:20px 23px;border:1px solid var(--line);border-radius:16px;max-height:520px;overflow:auto;background:var(--inset)}.panel-heading{display:flex;justify-content:space-between;align-items:center}.panel-heading h2{margin:0}.text-button{padding:0;min-height:32px;border:0;background:none;color:var(--muted);font-size:.8rem}.subtle{font-size:.8rem;color:var(--muted);line-height:1.7;margin-top:10px}#history{list-style:none;padding:0;margin:0}#history li{padding:17px 0;border-bottom:1px solid var(--line)}#history li button{display:block;text-align:left;background:none;border:0;width:100%;padding:0;min-height:0;font-family:Consolas,monospace;overflow-wrap:anywhere;font-size:.9rem}#history li span{display:block;text-align:right;color:var(--accent);font-family:Consolas,monospace;margin-top:7px;overflow-wrap:anywhere}.empty-history{font-size:.85rem;color:var(--muted);padding:25px 0}.try-section{margin-top:40px}.example-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.example-grid button{text-align:left;background:none;padding:18px 20px;border-radius:12px}.example-grid span{display:block;font-size:.8rem;color:var(--accent)}.example-grid code{display:block;font-size:1.1rem;margin:10px 0;color:var(--text)}.example-grid small{font-size:.75rem;color:var(--muted)}footer{border-top:1px solid var(--line);padding:24px 32px 32px;text-align:center;font-size:.73rem;color:var(--muted)}footer a{display:block;margin-top:7px;color:var(--muted)}[hidden]{display:none!important}.suggestions{display:flex;flex-wrap:wrap;gap:6px}.suggestions button{font-size:.75rem;min-height:34px;padding:3px 8px;text-align:left;overflow-wrap:anywhere;max-width:100%}.suggestions code{display:block;color:var(--muted);font-size:.7rem}.panel{border:1px solid var(--line);border-radius:14px;padding:22px;background:var(--panel);margin-bottom:20px}.panel>label,.panel>button{margin-bottom:16px}.panel form{margin:0}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:16px 0}.field-grid label{min-width:0}output{display:block;overflow-wrap:anywhere;white-space:pre-wrap}#distribution-result{font-family:Consolas,monospace;font-size:1.6rem;color:var(--accent);margin:20px 0}#distribution-expression{font-size:.8rem}details{margin:18px 0}summary{cursor:pointer;color:var(--muted);font-size:.85rem;min-height:32px}details label{margin:12px 0}.table-wrap{overflow-x:auto;max-width:100%;margin:12px 0}table{border-collapse:collapse;width:100%;text-align:left;font-size:.85rem}th{font-weight:500;color:var(--muted);white-space:nowrap}td,th{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}td:last-child{font-family:Consolas,monospace;overflow-wrap:anywhere}td code{font-size:.8rem}.data-table input{padding:6px 8px;min-width:55px}.data-table td{padding:5px}.data-table th{padding:5px}.graph-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px}.function-row{display:flex;gap:7px;align-items:center;margin:12px 0}.function-row input{font-family:Consolas,monospace;width:100%;min-width:0}.function-row button{padding:5px 9px}.function-color{display:block;flex-shrink:0;width:9px;height:25px;border-radius:5px}.graph-view{border:1px solid var(--line);border-radius:14px;overflow:hidden;min-width:0}#graph-canvas{display:block;width:100%;height:420px;touch-action:none}.canvas-toolbar{display:flex;gap:8px;align-items:center;padding:9px 12px;border-top:1px solid var(--line)}.canvas-toolbar span{font-size:.75rem;color:var(--muted);margin-right:auto}.canvas-toolbar button{padding:4px 10px}.analysis-layout{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:35px;min-width:0}.analysis-layout>div,.analysis-layout>form{min-width:0}.inline-form{display:flex;align-items:end;gap:10px}.inline-form label{flex:1;min-width:0}#analysis-result{margin-top:15px;color:var(--accent);font-family:Consolas,monospace}#stats-canvas{width:100%;height:280px;display:block;touch-action:none;margin-top:16px;border-radius:9px}.search-label{max-width:620px}.search-label input{font-size:1.1rem}.help-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:26px}.help-item{padding:22px;border:1px solid var(--line);border-radius:12px;min-width:0}.help-item h2{font-family:Consolas,monospace;color:var(--accent);font-size:1.2rem}.help-item code{display:block;font-size:.8rem;color:var(--muted);margin:12px 0}.help-item p{font-size:.85rem}.help-item small{display:block;color:var(--muted);font-size:.78rem}.help-item button{margin-top:15px;font-size:.8rem}
@media(max-width:800px){header{padding:20px 22px}nav{margin:0 22px}nav button{padding:13px 21px}main{padding:30px 22px 55px}h1{font-size:2.25rem}.workspace{grid-template-columns:1fr}.history-panel{max-height:300px}.example-grid{gap:9px}.example-grid button{padding:14px}.example-grid code{font-size:.9rem}.graph-layout{grid-template-columns:1fr}.graph-controls{display:grid;grid-template-columns:1fr auto;gap:5px 15px}.graph-controls h2,.graph-controls>p,.graph-controls>details{grid-column:1/-1}.graph-controls>button{align-self:start;margin-top:12px}.analysis-layout{grid-template-columns:1fr}.help-grid{grid-template-columns:1fr}}
@media(max-width:440px){header{padding:17px 16px}.brand{font-size:1.22rem}.brand-mark{width:37px;height:37px}.study-label{display:none}nav{margin:0 16px}nav button{padding:13px 17px;font-size:.88rem}main{padding:27px 16px 45px}.section-heading{gap:12px;align-items:start;margin-bottom:23px}h1{font-size:1.85rem}.section-heading p{font-size:.8rem}.mode-label{width:88px;font-size:.7rem}.mode-label select{padding:7px;font-size:.8rem}.expression-panel{padding:17px}.expression-panel textarea{font-size:1.2rem}.expression-bottom{gap:10px}.expression-bottom>span{font-size:.65rem;max-width:110px}.expression-bottom button{padding:9px 12px;font-size:.85rem}.result-box output{font-size:2rem}.example-grid{grid-template-columns:1fr}.example-grid button{padding:14px 17px}.example-grid code{margin:7px 0}.panel{padding:17px}.field-grid{gap:12px}#graph-canvas{height:310px}.canvas-toolbar{padding:8px}.canvas-toolbar span{font-size:.65rem}footer{padding:22px 16px}.inline-form{flex-wrap:wrap}.inline-form label{min-width:70px}.graph-controls{gap:5px 8px}.data-table{font-size:.78rem}.data-table td{padding:3px}.data-table input{min-width:45px;width:100%;padding:5px}.help-item{padding:17px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}