@font-face{font-family:Vazirmatn;src:url("Vazirmatn-Regular.ttf") format("truetype");font-weight:400;font-display:swap}
@font-face{font-family:Vazirmatn;src:url("Vazirmatn-Bold.ttf") format("truetype");font-weight:700 900;font-display:swap}
:root{--bg:#f7f3e8;--paper:#fffdf7;--ink:#14241c;--green:#174a35;--muted:#59685f;--yellow:#e7ad24;--mint:#e8f2eb;--line:#d7dfd8}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:94px}body{margin:0;background:var(--bg);color:var(--ink);font:18px/2.05 Vazirmatn,system-ui,sans-serif;text-rendering:optimizeLegibility}a{color:var(--green);text-underline-offset:5px;overflow-wrap:anywhere}button{font:inherit}button,a{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid #a26200;outline-offset:5px}::selection{background:#f3d677;color:var(--ink)}.skip{position:fixed;top:-100px;right:20px;z-index:50;background:var(--ink);color:white;padding:10px}.skip:focus{top:10px}.progress{height:3px;position:fixed;inset:0 0 auto;z-index:40;background:var(--yellow);transform:scaleX(0);transform-origin:right}.bar{position:sticky;top:0;z-index:30;background:rgba(247,243,232,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.bar-in{width:min(1180px,calc(100% - 40px));height:68px;margin:auto;display:flex;align-items:center;justify-content:space-between}.brand{display:inline-block;direction:ltr;color:var(--ink);font:900 23px/1.4 system-ui,sans-serif;letter-spacing:-1px;text-decoration:none}.brand span{color:#9c6d00}.back{font-size:13px;text-decoration:none;color:var(--muted)}
.hero{width:min(1180px,calc(100% - 40px));margin:64px auto 0}.eyebrow{color:#85620e;font-size:12px;font-weight:700}.hero h1{font-size:clamp(38px,5.5vw,70px);line-height:1.45;letter-spacing:-2.5px;margin:15px 0 18px}.hero h1 span{color:var(--green)}.lead{max-width:850px;color:var(--muted);font-size:22px;line-height:2;margin:0}.meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}.meta span{border:1px solid #cdd6ce;border-radius:99px;padding:4px 12px;color:var(--muted);font-size:12px}.hero-board{margin-top:40px;padding:25px 32px 18px;border:1.5px solid var(--ink);border-radius:25px;background:var(--paper);box-shadow:9px 9px 0 var(--yellow);background-image:linear-gradient(#174a3507 1px,transparent 1px),linear-gradient(90deg,#174a3507 1px,transparent 1px);background-size:24px 24px}.board-top{display:flex;justify-content:space-between;gap:16px;align-items:center;font-size:16px;font-weight:700}.board-top bdi{font:700 10px/1.5 system-ui,sans-serif;color:#5f7065;letter-spacing:1.6px}.board-flow{display:grid;grid-template-columns:1fr 35px 1fr 35px 1fr;gap:13px;margin-top:24px;align-items:center}.board-card{min-width:0;min-height:245px;padding:20px 24px;border:1.5px solid var(--ink);border-radius:16px;background:var(--bg);box-shadow:4px 4px 0 #14241c18}.number{display:block;font-size:11px;color:#616955}.board-card strong{display:block;font-size:24px;line-height:1.75;margin:18px 0 20px}.board-card small{font-size:11px}.question-card{background:#fff0be}.answer-card{background:var(--green);color:var(--paper)}.answer-card .number{color:#d1dfcf}.answer-card strong{font-size:21px;margin-top:12px;margin-bottom:10px}.answer-card em{color:#ffd97c;font-style:normal}.arrow{text-align:center;font-size:30px}.mini-page{height:122px;width:80%;border:1px solid #819c89;border-radius:6px;background:white;margin:12px auto 10px;padding:17px;transform:rotate(-3deg)}.mini-page i{display:block;height:7px;background:#dee7de;margin:7px 0;border-radius:2px}.mini-page i:nth-child(2){width:70%}.mini-page .marked{background:#eed067;height:10px}.board-caption{margin:22px 0 0;padding-top:14px;border-top:1px dashed #acb8ae;text-align:center;font-size:13px;color:var(--muted)}
.layout{width:min(1120px,calc(100% - 40px));margin:78px auto 95px;display:grid;grid-template-columns:minmax(0,780px) 230px;gap:70px;direction:ltr}.layout article,.toc{direction:rtl}.toc{position:sticky;top:110px;align-self:start;border-right:1px solid var(--line);padding-right:20px}.toc b{display:block;font-size:12px;color:var(--muted);margin-bottom:12px}.toc a{display:block;font-size:13px;color:var(--muted);text-decoration:none;padding:5px 0}.toc a:hover,.toc a.active{color:var(--green);font-weight:700}article{min-width:0}p{margin:0 0 21px;color:#425047}h2{font-size:clamp(28px,3.3vw,39px);line-height:1.55;letter-spacing:-1px;margin:70px 0 19px}h3{font-size:23px;line-height:1.7;margin:35px 0 12px}article section:first-of-type h2{margin-top:55px}.intro{padding:27px 30px;background:var(--yellow);border:2px solid var(--ink);border-radius:22px;box-shadow:6px 6px 0 var(--ink)}.intro>b{display:block;font-size:13px;margin-bottom:10px}.intro p{color:var(--ink);font-size:20px;margin:0 0 18px}.button{display:inline-block;text-decoration:none;border-radius:10px;font-size:14px;padding:10px 18px;font-weight:700}.button.dark{background:var(--ink);color:#fff9e9}.button:hover{background:#286145}.plain,.note,.warning{padding:21px 25px;margin:29px 0;border:1px solid #bdd6c6;background:var(--mint);border-radius:16px}.plain{border:none;border-right:5px solid var(--yellow);background:var(--paper)}.warning{background:#fff0e9;border-color:#dcbab1}.plain b,.note b,.warning b{display:block;font-size:16px;margin-bottom:6px}.plain p,.note p,.warning p{margin:0;font-size:15px}.warning b{color:#863e31}
.demo{margin:28px 0;border:1.5px solid var(--ink);border-radius:21px;overflow:hidden;background:var(--paper)}.demo-label{background:var(--green);color:#f2f4e7;padding:11px 20px;font-size:12px}.demo-choices{display:flex;gap:8px;flex-wrap:wrap;padding:20px;border-bottom:1px solid var(--line)}.demo-choices button{padding:8px 11px;font-size:13px;border:1px solid #b9c6bb;border-radius:9px;background:transparent;color:var(--ink);cursor:pointer}.demo-choices button[aria-pressed=true]{background:var(--yellow);border-color:var(--ink)}.demo-choices button:hover{border-color:var(--ink)}.demo-source,.demo-answer{padding:19px 23px}.demo-source{background:#edf3eb;border-bottom:1px solid var(--line)}.demo span{display:block;color:#5a6c60;font-size:11px;font-weight:700;margin-bottom:7px}.demo p{font-size:16px;margin:0}.demo-source a{font-size:12px}.demo-answer{min-height:125px}.demo .demo-foot{padding:15px 23px;background:#f1ede1;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
.table-wrap{overflow:auto;border:1px solid #b7c4b9;border-radius:15px;margin:25px 0 30px}table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.85}th,td{text-align:right;vertical-align:top;padding:15px 18px;border-left:1px solid var(--line);border-bottom:1px solid var(--line)}th{background:var(--green);color:white;font-size:13px}td{background:var(--paper)}td:first-child{width:34%;color:var(--ink)}td small{display:block;font:11px/1.7 system-ui,sans-serif;color:var(--muted);direction:ltr;text-align:right}tr:last-child td{border-bottom:0}td:last-child,th:last-child{border-left:0}
details{border:1px solid #bac9bd;border-radius:13px;background:var(--paper);margin:14px 0;overflow:hidden}summary{padding:16px 21px;cursor:pointer;font-size:16px;font-weight:700}details[open] summary{border-bottom:1px solid var(--line);background:#edf3eb}.detail-body{padding:20px 23px}.detail-body p{font-size:15px}.detail-body p:last-child{margin:0}code{direction:ltr;unicode-bidi:isolate;font:13px/1.7 ui-monospace,SFMono-Regular,Menlo,monospace;background:#e7e9df;padding:2px 5px;border-radius:4px;overflow-wrap:anywhere}.codebox{border:1px solid var(--ink);border-radius:15px;overflow:hidden;background:#17281e;direction:ltr;margin:24px 0}.codehead{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #526355;padding:11px 17px}.codehead b{font:12px/1.5 Vazirmatn,system-ui,sans-serif;color:#ffe19a}.copy{font:12px/1.5 Vazirmatn,sans-serif;border:1px solid #83968a;background:#273d2d;color:#fff8e8;border-radius:6px;padding:5px 11px;cursor:pointer}.copy:hover{background:#3d583f}pre{margin:0;padding:20px 18px;overflow:auto;white-space:pre;line-height:1.9}pre code{background:none;color:#fff1c8;padding:0;border-radius:0;font-size:12px;overflow-wrap:normal}ol.steps{padding-right:23px}ol.steps li{padding-right:5px;margin:16px 0;font-size:16px;color:#425047}
.finish{padding:28px 31px;background:#fff0c3;border:2px solid var(--ink);border-radius:21px;box-shadow:6px 6px 0 var(--ink);margin-top:65px}.finish h2{margin:0 0 15px}.sources{border-top:1px solid var(--line);margin-top:60px;padding-top:25px}.sources h2{font-size:25px;margin:0 0 15px}.sources p{font-size:14px}.sources>a{display:block;font-size:13px;margin:9px 0}.disclosure{font-size:12px;color:var(--muted);margin-top:35px}footer{padding:30px 20px;border-top:1px solid var(--line);text-align:center}footer p{font-size:12px;margin:10px 0 0;color:var(--muted)}
@media(max-width:980px){.layout{grid-template-columns:minmax(0,780px);justify-content:center}.toc{display:none}.hero h1{font-size:52px}.board-card{padding:15px;min-height:240px}.board-card strong{font-size:21px}.answer-card strong{font-size:18px}}
@media(max-width:620px){body{font-size:16px}.hero,.bar-in,.layout{width:calc(100% - 28px)}.bar-in{height:60px}.hero{margin-top:35px}.hero h1{font-size:35px;line-height:1.6;letter-spacing:-1.4px}.lead{font-size:18px}.meta span{font-size:10px;padding:4px 9px}.hero-board{padding:20px 18px 13px;box-shadow:5px 5px 0 var(--yellow);border-radius:18px;margin-top:30px}.board-top{font-size:14px}.board-top bdi{font-size:8px;letter-spacing:.5px}.board-flow{grid-template-columns:1fr;gap:10px;margin-top:20px}.board-card{min-height:0;padding:17px 20px}.board-card strong{font-size:22px;margin:7px 0 9px}.question-card strong br{display:none}.answer-card strong br{display:none}.answer-card strong em{display:block}.arrow{font-size:23px;transform:rotate(-90deg);height:25px;line-height:25px}.evidence-card{display:grid;grid-template-columns:1fr 110px;gap:5px 15px;align-items:center}.evidence-card .mini-page{grid-column:2;grid-row:1 / 3;height:80px;margin:0;width:100%;padding:8px 12px}.mini-page i{height:4px;margin:5px 0}.mini-page .marked{height:6px}.evidence-card small{grid-column:1;grid-row:2}.board-caption{font-size:11px}.layout{margin-top:48px;margin-bottom:65px}h2{margin-top:52px;font-size:29px}.intro,.finish{padding:21px;box-shadow:4px 4px 0 var(--ink)}.intro p{font-size:17px}.plain,.note,.warning{padding:18px}.demo-choices{padding:15px;gap:7px}.demo-choices button{font-size:12px}.demo-source,.demo-answer{padding:17px}.demo p{font-size:15px}th,td{padding:12px;font-size:13px}td:first-child{width:37%}.codehead{padding:10px 12px}.codehead b{font-size:10px}pre{padding:16px 12px}.table-wrap{margin-right:0;margin-left:0}.button{font-size:13px}summary{font-size:15px;padding:15px}.detail-body{padding:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.bar,.toc,.progress,.copy,.demo-choices,.skip{display:none}.hero,.layout{width:100%;margin:20px 0}.layout{display:block}body{background:white;font-size:12pt}.hero h1{font-size:30pt}.hero-board,.intro,.finish{box-shadow:none}h2{break-after:avoid;font-size:22pt}pre{white-space:pre-wrap}.codebox{break-inside:avoid}.demo-label{color:black;background:#eee}details .detail-body{display:block}.sources{break-before:page}}