/* StockNara — "Market paper": warm cream, one amber-gold accent, plain cards.
   A candlestick chart sheet fades in from the top corner and scrolls with the page.
   Instrument Sans for everything, Tajawal for Arabic. */
:root{
  --bg:#f6f3ec;--surface:#fffdf8;--surface-2:#f1ece1;--shell:rgba(40,30,15,.04);
  --ink:#1f1b16;--ink-2:#4f483e;--muted:#8a8275;--line:rgba(40,30,15,.10);--line-2:rgba(40,30,15,.18);
  --accent:#9a5b0b;--accent-ink:#ffffff;--accent-soft:#f3e6cf;--up:#2f7d4f;--down:#c0392b;
  --red:var(--accent);--blue:#4f483e;--yellow:var(--accent-soft);--brand:var(--accent);
  --ok:#2f7d4f;--warn:#b7791f;--danger:#c0392b;
  --r:14px;--r-sm:9px;--ease:cubic-bezier(.32,.72,0,1);
  --shadow:0 1px 2px rgba(70,50,20,.05),0 8px 24px -12px rgba(70,50,20,.16);
  --font:"Instrument Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --display:var(--font);
  --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
  --paper:url("market.svg");
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#14120e;--surface:#1c1914;--surface-2:#25211a;--shell:rgba(255,255,255,.04);
  --ink:#f2ede3;--ink-2:#c4bcae;--muted:#8d8577;--line:rgba(255,255,255,.08);--line-2:rgba(255,255,255,.16);
  --accent:#e3a73f;--accent-ink:#1a1206;--accent-soft:rgba(227,167,63,.16);--blue:#c4bcae;--up:#5cc58a;--down:#ff7a6b;
  --ok:#5cc58a;--warn:#fbbf24;--danger:#ff7a6b;--shadow:0 1px 2px rgba(0,0,0,.3),0 10px 28px -14px rgba(0,0,0,.6);
  --paper:url("market-dark.svg");color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#14120e;--surface:#1c1914;--surface-2:#25211a;--shell:rgba(255,255,255,.04);
  --ink:#f2ede3;--ink-2:#c4bcae;--muted:#8d8577;--line:rgba(255,255,255,.08);--line-2:rgba(255,255,255,.16);
  --accent:#e3a73f;--accent-ink:#1a1206;--accent-soft:rgba(227,167,63,.16);--blue:#c4bcae;--up:#5cc58a;--down:#ff7a6b;
  --ok:#5cc58a;--warn:#fbbf24;--danger:#ff7a6b;--shadow:0 1px 2px rgba(0,0,0,.3),0 10px 28px -14px rgba(0,0,0,.6);
  --paper:url("market-dark.svg");color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden;position:relative;min-height:100dvh}
/* market chart sheet fading in from the top corner; absolute so it scrolls away with the page */
body::before{content:"";position:absolute;z-index:-1;pointer-events:none;top:0;inset-inline-end:0;width:min(1200px,100%);height:1100px;
  background:var(--paper) top right/1200px 1100px no-repeat;opacity:.9;
  -webkit-mask-image:radial-gradient(ellipse 85% 80% at 100% 0,#000 18%,rgba(0,0,0,.45) 48%,transparent 74%);
          mask-image:radial-gradient(ellipse 85% 80% at 100% 0,#000 18%,rgba(0,0,0,.45) 48%,transparent 74%)}
[dir="rtl"] body::before{-webkit-mask-image:radial-gradient(ellipse 85% 80% at 0 0,#000 18%,rgba(0,0,0,.45) 48%,transparent 74%);mask-image:radial-gradient(ellipse 85% 80% at 0 0,#000 18%,rgba(0,0,0,.45) 48%,transparent 74%)}
@media (max-width:700px){body::before{opacity:.32;height:800px;background-size:880px 806px}}
a{color:var(--accent);text-underline-offset:3px}
img{max-width:100%}
::selection{background:var(--accent);color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
main.wrap{padding-top:92px}
h1,h2,h3{text-wrap:balance}
p{text-wrap:pretty}

/* ---------- top bar ---------- */
.top{position:fixed;top:12px;left:0;right:0;z-index:30;pointer-events:none}
.top .wrap{pointer-events:auto;display:flex;align-items:center;gap:10px;height:60px;max-width:1160px;width:calc(100% - 32px);margin:0 auto;padding:0 8px 0 16px;
  background:color-mix(in srgb,var(--surface) 82%,transparent);backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);
  border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
[dir="rtl"] .top .wrap{padding:0 16px 0 8px}
.logo{font:700 1.14rem/1 var(--font);color:var(--ink);text-decoration:none;letter-spacing:-.03em;display:inline-flex;align-items:center;direction:ltr;font-family:"Instrument Sans",sans-serif}
.logo::before{content:"";width:30px;height:30px;margin-right:9px;flex:none;border-radius:9px;
  background:var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M5 16l4.5-5 3.5 3 6-7' fill='none' stroke='%23fff' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/20px no-repeat}
.logo span{color:var(--accent)}
.nav{display:flex;gap:2px;margin-inline-start:auto;align-items:center}
.nav a{color:var(--ink-2);text-decoration:none;padding:8px 12px;border-radius:10px;font-weight:500;font-size:.88rem;transition:background .3s var(--ease),color .3s var(--ease)}
.nav a:hover{background:var(--shell);color:var(--ink)}
.nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent)}
.tools-bar{display:flex;gap:6px;align-items:center}
.icon-btn{border:1px solid var(--line-2);background:var(--surface);color:var(--ink);border-radius:11px;width:40px;height:40px;cursor:pointer;font-size:1rem;flex:none;
  display:grid;place-items:center;transition:background .3s var(--ease),transform .2s var(--ease)}
.icon-btn:hover{background:var(--surface-2)}.icon-btn:active{transform:scale(.94)}
.mini-sel{width:auto;min-height:40px;height:40px;padding:0 28px 0 12px;font:500 .84rem var(--font);background-color:var(--surface);border:1px solid var(--line-2);border-radius:11px;
  -webkit-appearance:none;appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--ink-2) 50%),linear-gradient(135deg,var(--ink-2) 50%,transparent 50%);
  background-position:calc(100% - 15px) 52%,calc(100% - 10px) 52%;background-size:5px 5px;background-repeat:no-repeat;cursor:pointer}
[dir="rtl"] .mini-sel{padding:0 12px 0 28px;background-position:15px 52%,10px 52%}
.i-sun{display:none}
:root[data-theme="dark"] .i-sun{display:inline}:root[data-theme="dark"] .i-moon{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .i-sun{display:inline}:root:not([data-theme="light"]) .i-moon{display:none}}
.menu-btn{display:none;position:relative}
.menu-btn i{position:absolute;left:11px;right:11px;top:50%;height:1.5px;background:var(--ink);transition:transform .5s var(--ease)}
.menu-btn i:nth-child(1){transform:translateY(-3.5px)}.menu-btn i:nth-child(2){transform:translateY(3.5px)}
.menu-open .menu-btn i:nth-child(1){transform:rotate(45deg)}.menu-open .menu-btn i:nth-child(2){transform:rotate(-45deg)}
@media (max-width:1100px){
  .menu-btn{display:grid}
  .tools-bar{margin-inline-start:auto}
  .nav{position:fixed;inset:0;z-index:-1;flex-direction:column;justify-content:center;align-items:stretch;gap:4px;padding:100px 24px 40px;margin:0;
    background:var(--bg);opacity:0;visibility:hidden;transition:opacity .4s var(--ease),visibility .4s}
  .nav a{font:600 1.5rem/1.2 var(--font);letter-spacing:-.025em;padding:14px 12px;color:var(--ink);border-radius:12px;
    transform:translateY(10px);opacity:0;transition:transform .6s var(--ease),opacity .6s var(--ease),background .3s}
  .menu-open .top .wrap{backdrop-filter:none;-webkit-backdrop-filter:none;background:var(--surface)}
  .menu-open .nav{opacity:1;visibility:visible}
  .menu-open{overflow:hidden}
  .menu-open .nav a{transform:none;opacity:1}
  .menu-open .nav a:nth-child(2){transition-delay:.04s}.menu-open .nav a:nth-child(3){transition-delay:.08s}.menu-open .nav a:nth-child(4){transition-delay:.12s}
  .menu-open .nav a:nth-child(5){transition-delay:.16s}.menu-open .nav a:nth-child(6){transition-delay:.2s}.menu-open .nav a:nth-child(7){transition-delay:.24s}
}
@media (max-width:520px){.top .wrap{gap:4px;padding:0 6px 0 10px}[dir="rtl"] .top .wrap{padding:0 10px 0 6px}.logo{font-size:1rem}.logo::before{width:26px;height:26px;margin-right:7px;background-size:17px}
  .icon-btn{width:36px;height:36px}.mini-sel{height:36px;min-height:36px;padding:0 22px 0 8px;font-size:.78rem;background-position:calc(100% - 12px) 52%,calc(100% - 7px) 52%}
  [dir="rtl"] .mini-sel{padding:0 8px 0 22px;background-position:12px 52%,7px 52%}#lang-sel{max-width:90px}}

/* ---------- hero ---------- */
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-weight:500;font-size:.84rem;color:var(--accent);background:var(--accent-soft);padding:6px 12px;border-radius:999px;margin-bottom:22px}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.hero{padding:64px 0 48px;position:relative}
.hero h1{font:700 clamp(2.4rem,6vw,4.4rem)/1.04 var(--font);letter-spacing:-.045em;margin:0 0 22px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{color:var(--ink-2);font-size:clamp(1.05rem,1.8vw,1.18rem);max-width:56ch;margin:0}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}

/* ---------- cards ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:14px;margin:8px 0 88px}
.card{grid-column:span 4;display:block;background:var(--surface);text-decoration:none;color:var(--ink);position:relative;border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--shadow);transition:transform .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease)}
.card>.in{height:100%;padding:24px;display:flex;flex-direction:column;gap:8px}
.card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 40%,transparent)}
.card:active{transform:translateY(-1px)}
.card .ico{width:44px;height:44px;display:grid;place-items:center;color:var(--accent);background:var(--accent-soft);border-radius:12px;margin-bottom:8px}
.card .ico svg{width:22px;height:22px}
.card h3{margin:0;font:600 1.1rem/1.3 var(--font);letter-spacing:-.02em}
.card p{margin:0;color:var(--ink-2);font-size:.94rem}
.card .go{margin-top:auto;padding-top:12px;display:inline-flex;align-items:center;gap:6px;font-weight:500;font-size:.88rem;color:var(--accent)}
.card .go b{font-weight:400;transition:transform .35s var(--ease)}
.card:hover .go b{transform:translate(2px,-2px)}
[dir="rtl"] .card .go b{transform:scaleX(-1)}[dir="rtl"] .card:hover .go b{transform:scaleX(-1) translate(2px,-2px)}
.grid.bento .card:nth-child(1){grid-column:span 8}
.grid.bento .card:nth-child(1)>.in{padding:30px;justify-content:flex-end;min-height:250px;border-radius:inherit;
  background:linear-gradient(90deg,var(--surface) 40%,transparent 85%),var(--paper) right top/900px 825px no-repeat}
[dir="rtl"] .grid.bento .card:nth-child(1)>.in{background:linear-gradient(-90deg,var(--surface) 40%,transparent 85%),var(--paper) left top/900px 825px no-repeat}
.grid.bento .card:nth-child(1) h3{font-size:clamp(1.6rem,3vw,2.2rem);letter-spacing:-.035em;max-width:14ch}
.grid.bento .card:nth-child(1) p{font-size:1.02rem;max-width:36ch}
.grid.bento .card:nth-child(1) .ico{width:52px;height:52px;background:var(--accent);color:var(--accent-ink)}
.grid.bento .card:nth-child(2){grid-column:span 4}
.grid.bento .card:nth-child(n+3){grid-column:span 3}
.grid.guides .card{grid-column:span 4}
@media (max-width:900px){.grid .card,.grid.bento .card:nth-child(n),.grid.guides .card{grid-column:span 6;grid-row:auto}.grid.bento .card:nth-child(1){grid-column:1/-1}.grid.bento .card:nth-child(1)>.in{min-height:210px}}
@media (max-width:620px){.grid{grid-template-columns:minmax(0,1fr)}.grid .card,.grid.bento .card:nth-child(n),.grid.guides .card{grid-column:1/-1}}
.section-h{font:700 clamp(1.5rem,3vw,2.1rem)/1.15 var(--font);letter-spacing:-.035em;margin:0 0 20px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 .95rem var(--font);border:1px solid transparent;border-radius:12px;
  padding:0 20px;cursor:pointer;background:var(--accent);color:var(--accent-ink);min-height:48px;text-decoration:none;
  box-shadow:0 1px 0 rgba(255,255,255,.15) inset,0 8px 20px -10px var(--accent);transition:transform .2s var(--ease),filter .3s var(--ease)}
.btn::after{content:"→";transition:transform .3s var(--ease)}
.btn:hover{filter:brightness(1.08)}
.btn:hover::after{transform:translateX(3px)}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.5;cursor:not-allowed}
[dir="rtl"] .btn::after{content:"←"}[dir="rtl"] .btn:hover::after{transform:translateX(-3px)}
.btn.ghost{background:var(--surface);color:var(--ink);border-color:var(--line-2);box-shadow:none}
.btn.ghost::after{display:none}
.btn.ghost:hover{background:var(--surface-2);filter:none}
.btn.sm{min-height:38px;font-size:.86rem;padding:0 14px}

/* ---------- tool page ---------- */
.crumbs{font-size:.84rem;color:var(--muted);padding-top:18px}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--ink)}
.tool-head{padding:18px 0 28px;max-width:820px}
.tool-head h1{font:700 clamp(1.9rem,4.4vw,3rem)/1.08 var(--font);margin:0 0 12px;letter-spacing:-.04em}
.tool-head p{margin:0;color:var(--ink-2);max-width:64ch;font-size:1.05rem}
.tool{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:16px;align-items:start}
@media (max-width:900px){.tool{grid-template-columns:minmax(0,1fr)}}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:24px;min-width:0;position:relative;box-shadow:var(--shadow)}
.panel[aria-live]{background:var(--surface)}
.panel-h{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:0 0 14px;font-weight:600;font-size:.92rem;color:var(--ink)}
.fields{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}
.fields .full{grid-column:1/-1}
@media (max-width:380px){.fields{grid-template-columns:minmax(0,1fr)}}
label{display:block;font-size:.84rem;font-weight:500;color:var(--ink-2);margin-bottom:6px}
.field{position:relative;min-width:0}
input,select,textarea{width:100%;min-width:0;text-overflow:ellipsis;font:400 1rem var(--font);color:var(--ink);background:var(--surface);border:1px solid var(--line-2);border-radius:var(--r-sm);padding:11px 12px;min-height:46px;
  font-variant-numeric:tabular-nums;transition:border-color .25s var(--ease),box-shadow .25s var(--ease)}
textarea{min-height:110px;resize:vertical;line-height:1.55}
input:hover,select:hover,textarea:hover{border-color:color-mix(in srgb,var(--ink) 30%,transparent)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
input[type="range"]{padding:0;min-height:0;height:28px;border:0;accent-color:var(--accent);cursor:pointer}
input[type="range"]:focus{box-shadow:none}
.check{display:flex;align-items:center;gap:9px;margin:0;padding:10px 12px;border:1px solid var(--line-2);border-radius:var(--r-sm);background:var(--surface);cursor:pointer;font-weight:500;font-size:.9rem;color:var(--ink)}
.check input{width:18px;height:18px;min-height:0;padding:0;margin:0;accent-color:var(--accent);flex:none;box-shadow:none}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips button{border:1px solid var(--line-2);background:var(--surface);color:var(--ink-2);border-radius:999px;padding:7px 13px;font:500 .86rem var(--font);cursor:pointer;transition:background .25s var(--ease),color .25s}
.chips button:hover{background:var(--surface-2);color:var(--ink)}
.chips button[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.note{font-size:.85rem;color:var(--muted);margin-top:14px}
.err{color:var(--danger);font-size:.9rem;font-weight:500;margin-top:10px;min-height:1em}
.result-main{padding:22px;margin-bottom:12px;background:var(--ink);color:var(--bg);border-radius:12px;position:relative;overflow:hidden}
.result-main::after{content:"";position:absolute;inset:auto 0 0 0;height:4px;background:var(--accent)}
.result-main .lbl{font-weight:500;font-size:.88rem;opacity:.85}
.result-main .big{font:700 clamp(2.6rem,7vw,3.6rem)/1 var(--font);letter-spacing:-.045em;margin-top:6px;font-variant-numeric:tabular-nums}
.result-main .sub{margin-top:6px;font-weight:500;opacity:.9}
.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px}
.stat{background:var(--surface-2);padding:12px 14px;border-radius:var(--r-sm)}
.stat .lbl{font-size:.8rem;font-weight:500;color:var(--muted)}
.stat .val{font:600 1.18rem var(--font);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
details>summary{cursor:pointer;font-weight:600}
.table-wrap{overflow:auto;margin-top:14px;border:1px solid var(--line);border-radius:var(--r-sm);max-height:420px}
table{width:100%;border-collapse:collapse;font-size:.9rem;font-variant-numeric:tabular-nums}
th,td{padding:9px 12px;text-align:start;border-bottom:1px solid var(--line)}
tbody tr:last-child td{border-bottom:0}
thead th{position:sticky;top:0;background:var(--surface-2);color:var(--ink-2);font-weight:600;font-size:.82rem}
.checklist{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:6px}
.checklist li{display:flex;gap:10px;align-items:flex-start;font-size:.92rem;color:var(--ink-2);padding:9px 12px;background:var(--surface-2);border-radius:var(--r-sm)}
.checklist li::before{content:"";flex:none;width:8px;height:8px;margin-top:7px;border-radius:50%;background:var(--muted)}
.checklist li.ok::before{background:var(--ok)}.checklist li.warn::before{background:var(--warn)}.checklist li.bad::before{background:var(--danger)}

/* ---------- student components ---------- */
.rows{display:grid;gap:8px}
.row-item{display:grid;grid-template-columns:minmax(0,2.2fr) minmax(0,1fr) minmax(0,1fr) 40px;gap:8px;align-items:end}
.row-item.w3{grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr) 40px}
.row-item label{font-size:.76rem}
.row-item .x{width:40px;height:46px;border:1px solid var(--line-2);background:var(--surface);color:var(--muted);border-radius:var(--r-sm);cursor:pointer;font-size:1rem;transition:background .25s,color .25s}
.row-item .x:hover{background:color-mix(in srgb,var(--danger) 12%,var(--surface));color:var(--danger)}
@media (max-width:520px){.row-item,.row-item.w3{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 40px}.row-item .nm{grid-column:1/-1}}
.letter{display:inline-grid;place-items:center;min-width:2.2em;padding:2px 8px;font:700 1rem var(--font);background:var(--accent-soft);color:var(--accent);border-radius:8px}
.cite-out{border:1px solid var(--line);border-radius:var(--r-sm);padding:16px 18px 16px 2.4em;text-indent:-1.6em;line-height:1.7;background:var(--surface-2);word-break:break-word;min-height:70px}
[dir="rtl"] .cite-out{direction:ltr;text-align:left}
.cite-out i{font-style:italic}
.timer{display:grid;place-items:center;gap:6px;padding:10px 0}
.ring{position:relative;width:min(290px,78vw);aspect-ratio:1}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:10}
.ring .bg{stroke:var(--line)}
.ring .fg{stroke:var(--accent);stroke-linecap:round;transition:stroke-dashoffset 1s linear,stroke .4s}
.ring.break .fg{stroke:var(--blue)}
.ring .t{position:absolute;inset:0;display:grid;place-items:center;align-content:center;gap:4px;text-align:center}
.ring .t b{font:600 clamp(3rem,13vw,4.2rem)/1 var(--font);letter-spacing:-.05em;font-variant-numeric:tabular-nums}
.ring .t span{font-weight:500;font-size:.9rem;color:var(--muted)}
.dots{display:flex;gap:8px;justify-content:center;margin-top:6px}
.dots i{width:12px;height:12px;border-radius:50%;border:1.5px solid var(--line-2)}
.dots i.done{background:var(--accent);border-color:var(--accent)}


/* ---------- finance components ---------- */
.affix{position:relative}
.affix input{padding-inline-end:40px}
.affix .unit{position:absolute;inset-inline-end:13px;top:50%;transform:translateY(-50%);font-size:.88rem;font-weight:500;color:var(--muted);pointer-events:none}
.seg{display:flex;flex-wrap:wrap;gap:4px;padding:4px;background:var(--surface-2);border-radius:12px}
.seg button{flex:1 1 auto;border:0;background:none;color:var(--ink-2);border-radius:9px;padding:9px 12px;font:500 .9rem var(--font);cursor:pointer;transition:background .3s var(--ease),color .3s}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px rgba(40,30,15,.1),0 0 0 1px var(--line)}
.stat.hi{background:var(--accent-soft)}
.stat.hi .val{color:var(--accent)}
.split{display:flex;height:10px;border-radius:10px;overflow:hidden;background:var(--line);margin:16px 0 8px}
.split i{display:block;height:100%;transition:width .6s var(--ease)}
.split .c1{background:var(--ink-2)}.split .c2{background:var(--accent)}.split .c3{background:var(--muted);opacity:.5}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.84rem;color:var(--ink-2);margin-top:8px}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend span::before{content:"";width:10px;height:3px;border-radius:2px;background:var(--c)}
.chart{width:100%;height:auto;display:block;margin-top:10px}
.chart text{font:500 11px var(--font);fill:var(--muted)}
.chart .g{stroke:var(--line);stroke-width:1}
.chart .ln{fill:none;stroke-width:2.2;stroke-linejoin:round;stroke-linecap:round}
.chart .ln.a{stroke:var(--accent)}.chart .ln.b{stroke:var(--ink-2);stroke-dasharray:5 5;stroke-width:1.6}.chart .ln.c{stroke:var(--up)}
.chart .ar.a{fill:var(--accent);opacity:.14}
.chart .mk{stroke:var(--muted);stroke-dasharray:3 4}
.row-item .sum output{display:flex;align-items:center;min-height:46px;font-weight:500;color:var(--ink-2);font-variant-numeric:tabular-nums}
.row-item.w3{grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1fr) 40px}
@media (max-width:520px){.row-item.w3{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 40px}.row-item.w3 .sum{display:none}}

/* ---------- hero demo ---------- */
.hero{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:0 48px;align-items:center;max-width:none}
.hero>*:not(.hero-demo){grid-column:1}
.hero-demo{grid-column:2;grid-row:1/span 5;display:grid;gap:8px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);align-self:center}
.hd-row{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.hd-row label{margin:0}
.hd-row b{font-weight:600;font-variant-numeric:tabular-nums}
.hd-out{display:grid;gap:2px;margin-top:6px;padding-top:12px;border-top:1px solid var(--line)}
.hd-out span{font-size:.86rem;color:var(--muted)}
.hd-out strong{font:700 clamp(1.9rem,4vw,2.4rem)/1.05 var(--font);letter-spacing:-.04em;color:var(--accent);font-variant-numeric:tabular-nums}
.hd-out small{color:var(--ink-2);font-size:.86rem}
@media (max-width:980px){.hero{grid-template-columns:minmax(0,1fr)}.hero-demo{grid-column:1;grid-row:auto;margin-top:34px}}

/* ---------- article ---------- */
.article{max-width:740px;margin:88px auto 0}
.article h2{font:700 clamp(1.4rem,2.6vw,1.85rem)/1.2 var(--font);margin:2.2em 0 .6em;letter-spacing:-.03em}
.article>h2:first-child{margin-top:0}
.article h3{font:600 1.1rem/1.35 var(--font);margin:1.6em 0 .4em;letter-spacing:-.015em}
.article p,.article li{color:var(--ink-2);font-size:1.04rem}
.article strong{color:var(--ink);font-weight:600}
.article ol,.article ul{padding-inline-start:1.3em}
.article li{margin:.35em 0}
.article code{font:500 .86em var(--mono);background:var(--shell);border:1px solid var(--line);border-radius:5px;padding:1px 5px}
.formula{background:var(--surface);border:1px solid var(--line);border-inline-start:3px solid var(--accent);border-radius:var(--r-sm);padding:16px 20px;font:500 .95rem/1.7 var(--mono);overflow-x:auto;color:var(--ink);margin:18px 0}
.example{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;margin:22px 0;box-shadow:var(--shadow)}
.example h3{margin-top:0;font-weight:600;font-size:.9rem;color:var(--accent)}
.faq details{border-bottom:1px solid var(--line);padding:0 4px}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{padding:16px 30px 16px 0;color:var(--ink);position:relative;list-style:none;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
[dir="rtl"] .faq summary{padding:16px 0 16px 30px}
.faq summary::after{content:"+";position:absolute;inset-inline-end:4px;top:13px;font-size:1.3rem;font-weight:400;color:var(--muted);transition:transform .35s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg);color:var(--accent)}
.faq details p{margin-top:0}
.related{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin:24px 0}
.related .card{grid-column:auto}
.guide h1{font:700 clamp(1.9rem,4.4vw,2.9rem)/1.08 var(--font);letter-spacing:-.04em;margin:18px 0 6px}
.article.guide{margin-top:20px}

/* ---------- static pages ---------- */
.page{max-width:740px;margin:0 auto;padding:40px 0}
.page h1{font:700 clamp(1.9rem,4.4vw,2.8rem)/1.08 var(--font);letter-spacing:-.04em;margin:0 0 20px}
.page h2{font:600 1.25rem var(--font);letter-spacing:-.02em;margin-top:2em}
.page p,.page li{color:var(--ink-2)}

/* ---------- trust strip ---------- */
.strip{display:flex;flex-wrap:wrap;gap:8px 20px;margin:30px 0 0}
.strip span{display:inline-flex;align-items:center;gap:8px;font-weight:500;font-size:.9rem;color:var(--ink-2)}
.strip span::before{content:"";width:16px;height:16px;flex:none;border-radius:50%;
  background:var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.2 2.2 4.8-5' fill='none' stroke='%239a5b0b' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/12px no-repeat}

/* ---------- footer ---------- */
.foot{margin-top:110px;padding:52px 0 40px;color:var(--muted);font-size:.92rem;border-top:1px solid var(--line)}
.foot .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px}
@media (max-width:700px){.foot .cols{grid-template-columns:1fr}}
.foot a{color:var(--ink-2);text-decoration:none;display:block;padding:4px 0;transition:color .25s var(--ease)}
.foot a:hover{color:var(--accent)}
.foot h4,.foot .fh{color:var(--ink);margin:0 0 10px;font-weight:600;font-size:.9rem}
.foot .logo{display:inline-flex;margin-bottom:8px}

/* ---------- scroll reveal ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}.ring .fg{transition:none}}

/* ---------- Arabic ---------- */
[dir="rtl"]{--font:"Tajawal","Instrument Sans",ui-sans-serif,system-ui,Tahoma,sans-serif}
[dir="rtl"] body{line-height:1.85}
[dir="rtl"] .hero h1,[dir="rtl"] .tool-head h1,[dir="rtl"] .guide h1,[dir="rtl"] .page h1{letter-spacing:0;line-height:1.3}
[dir="rtl"] .article h2,[dir="rtl"] .section-h,[dir="rtl"] .card h3,[dir="rtl"] .grid.bento .card:nth-child(1) h3,[dir="rtl"] .result-main .big,[dir="rtl"] .ring .t b{letter-spacing:0}
[dir="rtl"] .formula{direction:ltr;text-align:left}

.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media print{.top,.foot,.actions,.article,.crumbs,body::before{display:none}main.wrap{padding-top:0}}
@media (max-width:420px){.logo{font-size:.9rem}.logo::before{width:24px;height:24px;margin-right:6px}#lang-sel{max-width:76px;padding-inline:8px 20px}[dir="rtl"] #lang-sel{padding-inline:8px 20px}}

/* reserved ad spaces (3 per page); empty until AdSense is approved */
.ad-slot{display:block;min-height:120px;margin:28px 0;clear:both}
.ad-slot ins{margin:0!important}
@media (min-width:900px){.ad-slot{min-height:100px}}

.foot .fh{font-family:inherit}
.netlist{list-style:none;padding:0;display:grid;gap:12px}.netlist li{padding:14px 16px;border:1px solid var(--line);border-radius:12px}.netlist span{color:var(--ink-2)}.netlist small{color:var(--muted)}

.pbox{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 16px;align-items:center;margin:18px 0 0;padding:16px 18px;border:1px dashed var(--line-2);border-radius:14px;background:var(--surface)}
.pbox p{margin:2px 0 0;color:var(--ink-2)}.pbox-k{font-size:.74rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.pbox small{grid-column:1/-1;color:var(--muted);font-size:.76rem}
@media (max-width:600px){.pbox{grid-template-columns:minmax(0,1fr)}.pbox .btn{justify-self:start}}

/* nav-fit: keep top-bar links on one line */
.nav a{white-space:nowrap}
@media (max-width:1320px){.nav a{padding:8px 9px;font-size:.84rem}}

/* nav-fit: same as the mobile menu, used when the links do not fit */
html.nav-tight .menu-btn{display:grid}
html.nav-tight .tools-bar{margin-inline-start:auto}
html.nav-tight .nav{position:fixed;inset:0;z-index:-1;flex-direction:column;justify-content:center;align-items:stretch;gap:4px;padding:100px 24px 40px;margin:0;
    background:var(--bg);opacity:0;visibility:hidden;transition:opacity .4s var(--ease),visibility .4s}
html.nav-tight .nav a{font:600 1.5rem/1.2 var(--font);letter-spacing:-.025em;padding:14px 12px;color:var(--ink);border-radius:12px;
    transform:translateY(10px);opacity:0;transition:transform .6s var(--ease),opacity .6s var(--ease),background .3s}
html.nav-tight .menu-open .top .wrap{backdrop-filter:none;-webkit-backdrop-filter:none;background:var(--surface)}
html.nav-tight .menu-open .nav{opacity:1;visibility:visible}
html.nav-tight .menu-open{overflow:hidden}
html.nav-tight .menu-open .nav a{transform:none;opacity:1}
html.nav-tight .menu-open .nav a:nth-child(2){transition-delay:.04s}
html.nav-tight .menu-open .nav a:nth-child(3){transition-delay:.08s}
html.nav-tight .menu-open .nav a:nth-child(4){transition-delay:.12s}
html.nav-tight .menu-open .nav a:nth-child(5){transition-delay:.16s}
html.nav-tight .menu-open .nav a:nth-child(6){transition-delay:.2s}
html.nav-tight .menu-open .nav a:nth-child(7){transition-delay:.24s}