@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@500;700;900&family=JetBrains+Mono:wght@400;500;700&family=Noto+Sans+SC:wght@400;500;700&display=swap");:root{--paper:#f3efe3;--paper-2:#fbf9f1;--ink:#21262e;--ink-soft:#5e6672;--line:#d9d0b8;--line-strong:#b7ac8b;--seal:#a9382c;--seal-soft:#a9382c1a;--jade:#205c4b;--jade-soft:#205c4b1a;--gold:#97742a;--gold-soft:#97742a22;--shadow:0 1px 0 rgba(33,38,46,.06)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:repeating-linear-gradient(0deg,transparent,transparent 27px,rgba(33,38,46,.028) 28px),var(--paper);color:var(--ink);font-family:Noto Sans SC,sans-serif;-webkit-font-smoothing:antialiased;min-height:100vh}.wrap{max-width:1180px;margin:0 auto;padding:0 28px 80px}header{padding:44px 0 24px;display:flex;align-items:flex-start;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.brand-copy{max-width:640px}.eyebrow{font-family:JetBrains Mono,monospace;font-size:11.5px;letter-spacing:.16em;color:var(--seal);text-transform:uppercase;margin:0 0 10px;display:flex;align-items:center;gap:10px}.eyebrow:before{content:"";width:18px;height:1px;background:var(--seal);display:inline-block}h1{font-family:"Noto Serif SC",serif;font-weight:900;font-size:38px;line-height:1.25;margin:0 0 12px;letter-spacing:.01em}header p.lede{font-size:14.5px;line-height:1.75;color:var(--ink-soft);margin:0;max-width:560px}.seal{flex:0 0 auto;width:96px;height:96px;border-radius:50%;border:2.5px solid var(--seal);box-shadow:inset 0 0 0 4px var(--paper),inset 0 0 0 5px var(--seal);display:flex;align-items:center;justify-content:center;transform:rotate(-7deg);position:relative;margin-top:6px}.seal span{font-family:"Noto Serif SC",serif;font-weight:700;color:var(--seal);font-size:15px;line-height:1.15;text-align:center;letter-spacing:.06em}.seal:after{content:"";position:absolute;inset:10px;border:1px dashed var(--seal);border-radius:50%;opacity:.45}nav.tabs{display:flex;gap:2px;margin:0;border-bottom:1px solid var(--line);overflow-x:auto}nav.tabs button{font-family:Noto Sans SC,sans-serif;background:none;border:none;padding:18px 20px 15px;font-size:14.5px;font-weight:500;color:var(--ink-soft);cursor:pointer;white-space:nowrap;position:relative;display:flex;align-items:baseline;gap:8px}nav.tabs button .idx{font-family:JetBrains Mono,monospace;font-size:11px;color:var(--line-strong)}nav.tabs button.active{color:var(--ink);font-weight:700}nav.tabs button.active .idx{color:var(--seal)}nav.tabs button.active:after{content:"";position:absolute;left:20px;right:20px;bottom:-1px;height:2px;background:var(--gold)}nav.tabs button:hover{color:var(--ink)}nav.tabs button:focus-visible{outline:2px solid var(--gold);outline-offset:3px}.tool{display:none;padding-top:34px}.tool.active{display:block;animation:fade .35s ease}@keyframes fade{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.tool-head{margin-bottom:22px}.tool-head h2{font-family:"Noto Serif SC",serif;font-size:22px;margin:0 0 6px;font-weight:700}.tool-head p{margin:0;color:var(--ink-soft);font-size:13.5px;line-height:1.7;max-width:680px}.grid{display:grid;grid-template-columns:340px 1fr;grid-gap:26px;gap:26px;align-items:start}@media (max-width:860px){.grid{grid-template-columns:1fr}}.card{background:var(--paper-2);border:1px solid var(--line);box-shadow:var(--shadow)}.card+.card{margin-top:18px}.card-title{font-family:JetBrains Mono,monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);padding:12px 16px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.card-body{padding:16px}.field{margin-bottom:13px}.field:last-child{margin-bottom:0}.field label{display:block;font-size:12.5px;color:var(--ink-soft);margin-bottom:5px}.field-row{display:flex;gap:10px}.field-row .field{flex:1 1}input[type=number],input[type=text],select{width:100%;font-family:JetBrains Mono,monospace;font-size:13.5px;padding:9px 10px;border:1px solid var(--line-strong);background:#fff;color:var(--ink)}select{font-family:Noto Sans SC,sans-serif}input:focus,select:focus{outline:2px solid var(--gold);outline-offset:0;border-color:var(--gold)}.btn{font-family:Noto Sans SC,sans-serif;font-size:13px;font-weight:500;padding:9px 14px;background:var(--ink);color:var(--paper-2);border:1px solid var(--ink);cursor:pointer}.btn:hover{background:#000}.btn.ghost{background:transparent;color:var(--ink)}.btn.ghost:hover{background:var(--gold-soft)}.btn.small{padding:5px 9px;font-size:11.5px}.btn:focus-visible{outline:2px solid var(--gold);outline-offset:2px}.btn:disabled{opacity:.5;cursor:wait}.btn-row{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));grid-gap:1px;gap:1px;background:var(--line);border:1px solid var(--line);margin-bottom:16px}.stat{background:var(--paper-2);padding:13px 14px}.stat .k{font-size:11px;color:var(--ink-soft);margin-bottom:5px}.stat .v{font-family:JetBrains Mono,monospace;font-size:17px;font-weight:700}.v.pos{color:var(--seal)}.v.neg{color:var(--jade)}canvas{width:100%;display:block;background:#fff;border:1px solid var(--line)}table.legs{width:100%;border-collapse:collapse;font-size:12.5px}table.legs th{text-align:left;font-weight:500;color:var(--ink-soft);font-size:11px;padding:6px 8px;border-bottom:1px solid var(--line-strong);font-family:JetBrains Mono,monospace;text-transform:uppercase;letter-spacing:.04em}table.legs td{padding:5px 8px;border-bottom:1px solid var(--line);vertical-align:middle}table.legs input,table.legs select{padding:6px 7px;font-size:12.5px}table.legs tr:last-child td{border-bottom:none}.leg-dir-buy{color:var(--seal);font-weight:700}.leg-dir-sell{color:var(--jade);font-weight:700}.rm{background:none;border:none;color:var(--ink-soft);cursor:pointer;font-size:15px;line-height:1;padding:4px}.rm:hover{color:var(--seal)}.note{font-size:12px;color:var(--ink-soft);line-height:1.7;border-left:2px solid var(--gold);padding:8px 12px;background:var(--gold-soft)}.formula{font-family:JetBrains Mono,monospace;font-size:12.5px;background:var(--paper);border:1px solid var(--line);padding:12px 14px;line-height:1.9;color:var(--ink);white-space:pre-wrap}.formula b{color:var(--seal)}.legend{display:flex;gap:18px;font-size:12px;color:var(--ink-soft);margin-top:10px;flex-wrap:wrap}.legend span{display:inline-flex;align-items:center;gap:6px}.sw{width:11px;height:11px;display:inline-block;border-radius:2px}footer{margin-top:56px;padding-top:20px;border-top:1px solid var(--line);font-size:11.5px;color:var(--ink-soft);line-height:1.8;font-family:JetBrains Mono,monospace}::-webkit-scrollbar{height:8px;width:8px}::-webkit-scrollbar-thumb{background:var(--line-strong)}.live-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px}.live-dot{width:7px;height:7px;border-radius:50%;background:var(--line-strong);display:inline-block;flex:0 0 auto}.live-dot.on{background:var(--jade);box-shadow:0 0 0 3px var(--jade-soft)}.live-dot.err{background:var(--seal);box-shadow:0 0 0 3px var(--seal-soft)}.live-status{font-family:JetBrains Mono,monospace;font-size:11.5px;color:var(--ink-soft)}.live-status.err{color:var(--seal)}.field-inline{display:flex;gap:8px;align-items:flex-end}.field-inline .field{flex:1 1;margin-bottom:0}.scroll-x{overflow-x:auto}table.chain{width:100%;border-collapse:collapse;font-size:12px;white-space:nowrap}table.chain th{position:-webkit-sticky;position:sticky;top:0;background:var(--paper-2);text-align:right;font-weight:500;color:var(--ink-soft);font-size:10.5px;padding:7px 8px;border-bottom:1px solid var(--line-strong);font-family:JetBrains Mono,monospace;text-transform:uppercase;letter-spacing:.03em}table.chain td.strike-col,table.chain th.strike-col{text-align:center}table.chain td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:right;font-family:JetBrains Mono,monospace}table.chain tbody tr:hover{background:var(--gold-soft)}table.chain td.strike-col{font-family:Noto Sans SC,sans-serif;font-weight:700;background:var(--paper);border-left:1px solid var(--line-strong);border-right:1px solid var(--line-strong)}table.chain .call-side{color:var(--seal)}table.chain .put-side{color:var(--jade)}table.chain .load-btn{font-family:Noto Sans SC,sans-serif;font-size:10.5px;padding:3px 7px;background:transparent;border:1px solid var(--line-strong);color:var(--ink-soft);cursor:pointer}table.chain .load-btn:hover{border-color:var(--gold);color:var(--ink);background:var(--gold-soft)}.pill{display:inline-block;font-family:JetBrains Mono,monospace;font-size:10.5px;padding:2px 7px;border:1px solid var(--line-strong)}.muted,.pill{color:var(--ink-soft)}.greek-compare{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));grid-gap:1px;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:10px}.greek-compare .stat{padding:10px 12px}.greek-compare .stat .k{font-size:10px}.greek-compare .stat .v{font-size:14px}