/* shared skeleton for the three thesis-tool landing pages; each page's identity.css owns the look */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}
body{margin:0;background:var(--bg);color:var(--fg);font:400 1.0625rem/1.7 var(--f-b);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
html[lang=fa] body{line-height:1.95}
.l-fa{display:none}
html[lang=fa] .l-en{display:none}
html[lang=fa] .l-fa{display:inline}
html[lang=fa] .l-fa.blk{display:block}
a{color:var(--acc-ink,var(--acc));text-underline-offset:.2em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--acc);outline-offset:3px;border-radius:4px}
.skip{position:absolute;inset-inline-start:12px;top:-60px;background:var(--fg);color:var(--bg);padding:.6rem 1rem;border-radius:8px;z-index:100;transition:top .15s}
.skip:focus{top:10px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.wrap{width:min(1180px,100% - 2.5rem);margin-inline:auto}
.mono,code,pre,kbd{font-family:var(--f-m)}
code{font-size:.92em;direction:ltr;unicode-bidi:isolate}
/* header */
.top{position:sticky;top:0;z-index:50;background:var(--hd);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:1rem;min-height:62px}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--fg);font:700 1.15rem var(--f-d);letter-spacing:-.01em}
.brand svg{width:26px;height:26px;color:var(--acc);flex:none}
.brand .fa-name{display:none;font:800 1rem Vazirmatn;opacity:.6}
html[lang=fa] .brand .fa-name{display:inline}
.nav{display:flex;gap:1.15rem;margin-inline:auto;font-size:.92rem}
.nav a{color:var(--muted);text-decoration:none;padding:.25rem 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.on{color:var(--fg);border-bottom-color:var(--acc)}
.tools{display:flex;gap:.45rem;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:42px;padding:.45rem 1rem;border:1px solid var(--line-2);border-radius:var(--r);background:transparent;color:var(--fg);font:600 .92rem var(--f-b);text-decoration:none;cursor:pointer;transition:transform .15s,background .15s,border-color .15s}
.btn:hover{border-color:var(--acc);transform:translateY(-1px)}
.btn svg{width:18px;height:18px}
.btn.pri{background:var(--acc);border-color:var(--acc);color:var(--on-acc)}
.btn.pri:hover{filter:brightness(1.08)}
.btn.icon{width:42px;padding:0}
.tog .t-sun{display:none}
html[data-theme=dark] .tog .t-sun{display:block}
html[data-theme=dark] .tog .t-moon{display:none}
.tog{position:relative}
html[data-theme-mode=system] .tog::after{content:"A";position:absolute;inset-inline-end:3px;bottom:2px;font:700 .55rem var(--f-m);color:var(--acc)}
.menu-btn{display:none}
@media (max-width:900px){
 .menu-btn{display:inline-flex}
 .nav{position:absolute;inset-inline:0;top:100%;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:.5rem 1.25rem 1rem;display:none;margin:0}
 .nav.open{display:flex}
 .nav a{padding:.7rem 0;border-bottom:1px solid var(--line)}
 .hd-gh{display:none}
}
/* hero */
.hero{padding:clamp(2.5rem,6vw,5.5rem) 0 clamp(2rem,4vw,3.5rem);position:relative}
.hero-grid{display:grid;grid-template-columns:1.02fr 1fr;gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
@media (max-width:980px){.hero-grid{grid-template-columns:1fr}}
.kicker{display:inline-flex;align-items:center;gap:.6rem;font:600 .8rem var(--f-m);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 1.1rem}
html[lang=fa] .kicker{text-transform:none;letter-spacing:0;font-family:var(--f-b);font-size:.9rem}
.kicker i{width:9px;height:9px;border-radius:50%;background:var(--acc);display:inline-block}
h1{font:var(--h1-w,700) clamp(2.3rem,5.6vw,4.4rem)/1.04 var(--f-d);letter-spacing:-.025em;margin:0 0 1.2rem;text-wrap:balance}
html[lang=fa] h1{font-family:Vazirmatn;font-weight:800;line-height:1.35;letter-spacing:0;font-size:clamp(2rem,4.8vw,3.6rem)}
h1 em{font-style:normal;color:var(--acc-ink,var(--acc))}
.lede{font-size:1.14rem;color:var(--fg-2);max-width:60ch;margin:0 0 1.6rem}
.cta{display:flex;flex-wrap:wrap;gap:.7rem;margin-bottom:1.3rem}
.badges{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem;padding:0;margin:0}
.badges li{font:600 .76rem var(--f-m);padding:.25rem .65rem;border:1px solid var(--line-2);border-radius:99px;color:var(--muted)}
.stage{position:relative;min-width:0}
/* sections */
section{padding:clamp(2.6rem,6vw,5rem) 0;border-top:1px solid var(--line);position:relative}
.label{font:700 .78rem var(--f-m);letter-spacing:.1em;text-transform:uppercase;color:var(--acc-ink,var(--acc));margin:0 0 .7rem}
html[lang=fa] .label{letter-spacing:0;text-transform:none;font:800 .95rem Vazirmatn}
h2{font:var(--h2-w,700) clamp(1.7rem,3.4vw,2.6rem)/1.15 var(--f-d);letter-spacing:-.02em;margin:0 0 1.4rem;text-wrap:balance}
html[lang=fa] h2{font-family:Vazirmatn;font-weight:800;line-height:1.45;letter-spacing:0}
h3{font:700 1.12rem/1.35 var(--f-d);margin:0 0 .5rem}
html[lang=fa] h3{font-family:Vazirmatn;font-weight:800}
p{margin:0 0 1rem}
.sec-body>p:last-child{margin-bottom:0}
.prose{max-width:68ch}
/* demo output */
.term{border:1px solid var(--line-2);border-radius:var(--r);background:var(--code-bg);color:var(--code-fg);overflow:hidden;box-shadow:var(--shadow)}
.term-bar{display:flex;align-items:center;gap:.5rem;padding:.55rem .9rem;border-bottom:1px solid var(--line-2);font:600 .78rem var(--f-m);color:var(--code-dim)}
.term-bar b{font-weight:600}
.term pre{margin:0;padding:1rem 1.1rem;overflow:auto;font-size:.8rem;line-height:1.62;direction:ltr;text-align:left;max-height:34rem;tab-size:4;white-space:pre}
.term pre::-webkit-scrollbar{height:9px;width:9px}.term pre::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:9px}
details.more{margin-top:1rem}
details.more>summary{cursor:pointer;font-weight:700;padding:.5rem 0;list-style:none;color:var(--acc-ink,var(--acc))}
details.more>summary::-webkit-details-marker{display:none}
details.more>summary::before{content:"+";display:inline-block;width:1.2em;font-family:var(--f-m)}
details.more[open]>summary::before{content:"−"}
.note{font-size:.88rem;color:var(--muted);margin-top:.9rem}
/* code blocks with copy */
.code{position:relative;direction:ltr;text-align:left;background:var(--code-bg);color:var(--code-fg);border:1px solid var(--line-2);border-radius:var(--r);margin:.4rem 0 1rem}
.code pre{margin:0;padding:.95rem 3.2rem .95rem 1.05rem;overflow:auto;font-size:.84rem;line-height:1.65}
.code .cp{position:absolute;top:.45rem;right:.45rem;width:34px;height:34px;border:1px solid var(--line-2);border-radius:8px;background:transparent;color:var(--code-dim);cursor:pointer;display:grid;place-items:center}
.code .cp:hover{color:var(--acc);border-color:var(--acc)}
.cp svg{width:17px;height:17px}.cp .ok{display:none}.cp.done .ok{display:block}.cp.done .cpi{display:none}
/* cards / grids */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:1.1rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:1.35rem 1.4rem}
.card p{color:var(--fg-2);margin:0;font-size:.98rem}
.feat .n{font:700 .8rem var(--f-m);color:var(--acc-ink,var(--acc));display:block;margin-bottom:.6rem}
.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;gap:1.2rem}
.steps li{counter-increment:s;position:relative;padding-inline-start:3.1rem}
.steps li::before{content:counter(s);position:absolute;inset-inline-start:0;top:0;width:2.1rem;height:2.1rem;border-radius:50%;border:1.5px solid var(--acc);display:grid;place-items:center;font:700 .9rem var(--f-m);color:var(--acc-ink,var(--acc))}
.how{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:1.1rem;counter-reset:h}
.how .card{counter-increment:h}
.how .card h3::before{content:counter(h,decimal-leading-zero) "  ";font-family:var(--f-m);color:var(--acc-ink,var(--acc));font-size:.85em}
.limits{list-style:none;padding:0;margin:0;display:grid;gap:.8rem}
.limits li{position:relative;padding:.9rem 1.1rem;padding-inline-start:2.6rem;border:1px solid var(--line);border-radius:var(--r);background:var(--card);color:var(--fg-2);font-size:.98rem}
.limits li::before{content:"!";position:absolute;inset-inline-start:.9rem;top:.85rem;width:1.1rem;height:1.1rem;border-radius:50%;background:var(--warn);color:var(--bg);font:800 .72rem/1.1rem var(--f-m);text-align:center}
.claim{border:1px solid var(--acc);background:var(--claim-bg,transparent);border-radius:var(--r);padding:1.1rem 1.3rem;margin-bottom:1.4rem}
.claim p{margin:0 0 .5rem}.claim p:last-child{margin:0;font-size:.9rem;color:var(--muted)}
.tblw{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r)}
.tbl{width:100%;border-collapse:collapse;font-size:.92rem;min-width:640px}
.tbl th,.tbl td{padding:.75rem .9rem;text-align:start;vertical-align:top;border-bottom:1px solid var(--line)}
.tbl th{font:700 .78rem var(--f-m);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--card)}
html[lang=fa] .tbl th{font-family:Vazirmatn;letter-spacing:0;text-transform:none;font-size:.88rem}
.tbl tr:last-child td{border-bottom:0}
.tbl td:first-child{font-weight:600;min-width:12rem}
.faq details{border-bottom:1px solid var(--line);padding:.9rem 0}
.faq summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:700 1.2rem var(--f-m);color:var(--acc)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:.7rem 0 0;color:var(--fg-2);max-width:68ch}
.links{display:flex;flex-wrap:wrap;gap:.7rem}
footer{border-top:1px solid var(--line);padding:2rem 0 3rem;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between}
.rv{opacity:0;transform:translateY(14px);transition:opacity .6s,transform .6s}
.rv.in{opacity:1;transform:none}
html:not(.js) .rv{opacity:1;transform:none}
img.shot{display:block;max-width:100%;height:auto}
.sec-head,.sec-body,.hero-copy{min-width:0}
.sec{display:grid;grid-template-columns:minmax(0,1fr)}
.steps,.limits{grid-template-columns:minmax(0,1fr)}.steps li{min-width:0}