@font-face{font-family:Vazirmatn;src:url("assets/fonts/Vazirmatn-Variable.woff2") format("woff2");font-style:normal;font-weight:100 900;font-display:swap}
:root{color-scheme:light;--background:#f9f6ef;--ink:#292a27;--muted:#696a62;--line:#deded1;--accent:#b74631;--coral:#ef765e;--paper:#fffdf8;--soft:#eeeee3;--note:#f0eee5;--shadow:0 24px 65px -35px #55534050}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){color-scheme:dark;--background:#20221f;--ink:#f2efe6;--muted:#b0b2a7;--line:#44473e;--accent:#f58d76;--paper:#2a2d27;--soft:#30342c;--note:#2a2d27;--shadow:0 24px 65px -35px #0009}}
:root[data-theme="dark"]{color-scheme:dark;--background:#20221f;--ink:#f2efe6;--muted:#b0b2a7;--line:#44473e;--accent:#f58d76;--paper:#2a2d27;--soft:#30342c;--note:#2a2d27;--shadow:0 24px 65px -35px #0009}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--background);color:var(--ink);font-family:Vazirmatn,Arial,sans-serif;line-height:1.8;-webkit-font-smoothing:antialiased}button,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}a{color:inherit}button,select{color:inherit}a:focus-visible,button:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:5px}button{cursor:pointer}button:disabled{cursor:default}svg{flex-shrink:0}img{display:block;max-width:100%}[hidden]{display:none!important}.page-shell{width:min(1184px,calc(100% - 96px));margin-inline:auto}.site-header{min-height:116px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:10px;align-items:center;text-decoration:none}.brand-mark{width:46px;height:46px}.wordmark{height:35px;width:65px;object-fit:contain;filter:brightness(0);opacity:.82}.preferences{display:flex;gap:17px;align-items:center;font-size:13px;direction:ltr}.preferences button{border:0;background:none;padding:9px 4px;min-width:35px;font-weight:600}.theme-control{display:flex;gap:6px;align-items:center}.theme-control select{max-width:104px;border:0;background:transparent;cursor:pointer;padding:8px 1px;font-size:13px}.theme-control option{background:var(--background);color:var(--ink)}.control-divider{height:17px;width:1px;background:var(--line)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:8px;inset-inline-start:8px;transform:translateY(-150%);z-index:10;padding:8px 16px;background:var(--paper);color:var(--ink);border:1px solid var(--line)}.skip-link:focus{transform:translateY(0)}
.hero{display:grid;grid-template-columns:1fr 1fr;gap:66px;align-items:center;padding:78px 0 82px;min-height:655px}.eyebrow{display:flex;align-items:center;gap:12px;font-size:13px;font-weight:500;color:var(--muted);margin:0 0 22px}.small-line{width:26px;height:1px;background:var(--accent)}h1{font-size:clamp(54px,5.8vw,77px);font-weight:750;letter-spacing:-2.8px;line-height:1.5;margin:0 0 17px}.accent{color:var(--accent)}.hero-description{max-width:420px;font-size:16px;color:var(--muted);line-height:2.1;margin:0 0 28px}.primary-link{display:inline-flex;align-items:center;justify-content:center;gap:34px;text-decoration:none;background:var(--ink);color:var(--background);min-height:56px;padding:13px 24px;font-weight:600;font-size:15px;border:1px solid var(--ink);border-radius:8px;transition:background .18s,transform .18s}.primary-link:hover{background:var(--accent);border-color:var(--accent);color:var(--paper);transform:translateY(-2px)}.version-note{font-size:11px;color:var(--muted);margin:12px 0 0}.learning-scene{position:relative;isolation:isolate;margin:12px 0 0;padding:20px 12px 38px;min-width:0}.orbit{position:absolute;inset:0;z-index:-1;border:1px solid var(--line);border-radius:50%;pointer-events:none}.orbit-one{transform:rotate(-34deg) scale(1.05,.75);inset:-20px -12px 8px}.orbit-two{transform:rotate(-34deg) scale(.86,1.06);border-style:dashed;opacity:.6;inset:0 35px 40px}.note-sheet{position:relative;transform:rotate(3deg);background:var(--paper);border:1px solid var(--line);border-radius:6px;box-shadow:var(--shadow);padding:24px 28px 0;max-width:408px;margin:auto}.sheet-heading{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:14px}.sheet-dot{width:6px;height:6px;background:var(--coral);border-radius:50%}.sheet-number{margin-inline-start:auto;opacity:.6;font-size:10px;letter-spacing:1px}.sample-question{font-size:19px;font-weight:650;margin:24px 0 8px}.equation{font-size:33px;font-weight:500;letter-spacing:2px;text-align:center;margin:10px 0 24px;line-height:1.6}.answer-line{display:flex;align-items:flex-start;gap:12px;margin-bottom:17px;font-size:12px}.answer-line p{margin:0;line-height:1.9}.step-number{display:flex;justify-content:center;align-items:center;border:1px solid var(--line);border-radius:50%;width:24px;height:24px;flex:0 0 24px;font-size:11px;color:var(--muted);margin-top:1px}.answer-line .small-equation{display:flex;align-items:center;gap:16px;font-size:22px;letter-spacing:1px;margin-top:4px;text-align:start}.small-equation svg{color:var(--accent)}.sheet-footer{margin-top:18px;border-top:1px solid var(--line);padding:13px 0;display:flex;align-items:center;gap:8px;color:var(--muted);font-size:10px}.floating-note{position:absolute;bottom:37px;inset-inline-end:-14px;display:flex;align-items:center;gap:11px;transform:rotate(-7deg);background:var(--soft);border:1px solid var(--line);box-shadow:0 6px 16px #00000009;padding:10px 18px;font-size:14px;font-weight:600;border-radius:3px}.spark{color:var(--accent);font-size:29px;line-height:1}figcaption{text-align:center;font-size:10px;color:var(--muted);margin-top:25px;transform:translateY(10px)}
.learning-path{border-block:1px solid var(--line);display:grid;grid-template-columns:1fr 2.1fr;gap:48px;padding:32px 0 34px}.section-label{font-size:11px;letter-spacing:.4px;color:var(--accent);margin:0 0 7px}h2{font-size:22px;font-weight:650;line-height:1.7;margin:0}.path-steps{list-style:none;margin:0;padding:3px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:26px}.path-number{display:block;font-size:10px;color:var(--accent);font-weight:500;margin-bottom:9px;letter-spacing:1px}.path-steps h3{font-size:14px;font-weight:650;margin:0 0 7px}.path-steps p{font-size:12px;line-height:1.9;margin:0;color:var(--muted)}.early-note{display:flex;gap:14px;max-width:760px;margin:46px auto 43px;padding:0 12px}.early-indicator{margin-top:11px;height:7px;width:7px;border-radius:50%;background:var(--accent);flex:0 0 7px}.early-note h2{font-size:13px;margin-bottom:5px}.early-note p{font-size:11px;line-height:2.1;color:var(--muted);margin:0}.site-footer{border-top:1px solid var(--line);padding:23px 0 25px;font-size:11px;color:var(--muted)}.site-footer p{margin:0}.site-footer a{display:flex;gap:8px;text-underline-offset:5px;text-decoration-color:var(--line)}.site-footer a:hover{color:var(--accent)}.domain{margin-inline-start:auto;font-size:11px;letter-spacing:1px}html[dir="ltr"] h1{line-height:1.22;letter-spacing:-2.9px;font-size:clamp(54px,5.3vw,71px)}html[dir="ltr"] .hero-description{line-height:1.9}html[dir="ltr"] .direction-arrow{transform:scaleX(-1)}html[dir="ltr"] .note-sheet{transform:rotate(-3deg)}html[dir="ltr"] .floating-note{transform:rotate(7deg)}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]) .wordmark{filter:brightness(0) invert(1);opacity:.94}}:root[data-theme="dark"] .wordmark{filter:brightness(0) invert(1);opacity:.94}
@media(min-width:1440px){.hero{padding-top:95px;padding-bottom:100px}}
@media(max-width:1000px){.page-shell{width:calc(100% - 64px)}.hero{gap:34px;padding:62px 0 65px;min-height:auto}h1{font-size:60px}.hero-description{font-size:14px}.note-sheet{padding:20px 21px 0}.learning-scene{padding-inline:0}.floating-note{inset-inline-end:-7px}.learning-path{gap:30px;grid-template-columns:1fr 2.2fr}.path-steps{gap:18px}.path-intro h2{font-size:19px}.path-steps h3{font-size:13px}}
@media(max-width:740px){.page-shell{width:calc(100% - 40px)}.site-header{min-height:87px}.brand-mark{height:38px;width:38px}.wordmark{height:30px;width:57px}.preferences{gap:11px}.hero{grid-template-columns:1fr;gap:35px;padding:42px 0 48px}.hero-copy{text-align:center}.eyebrow{justify-content:center;font-size:11px;margin-bottom:18px}h1{font-size:61px;letter-spacing:-2px;line-height:1.45;margin-bottom:15px}.hero-description{max-width:390px;margin:0 auto 23px;font-size:14px;line-height:2}.primary-link{min-height:54px;padding:11px 23px;gap:27px;font-size:14px}.version-note{font-size:10px}.learning-scene{width:min(100% - 26px,420px);margin:0 auto;padding-top:16px;padding-bottom:28px}.note-sheet{padding:21px 25px 0;max-width:355px}.orbit-one{inset:-2px -6px 15px}.orbit-two{inset:0 25px 30px}.floating-note{inset-inline-end:-10px;bottom:26px;font-size:12px;padding:9px 14px}.sample-question{font-size:18px;margin-top:20px}.equation{font-size:30px;margin:8px 0 20px}.answer-line{font-size:11px}.answer-line .small-equation{font-size:20px}.sheet-footer{font-size:9px}figcaption{font-size:9px;margin-top:22px}.learning-path{grid-template-columns:1fr;gap:24px;padding:27px 0 29px}.section-label{font-size:10px;margin-bottom:3px}.path-intro h2{font-size:22px}.path-steps{grid-template-columns:1fr;gap:19px}.path-steps li{display:flex;align-items:flex-start;gap:18px}.path-number{padding-top:4px;min-width:22px;margin:0}.path-steps h3{font-size:14px;margin-bottom:2px}.path-steps p{font-size:12px}.early-note{margin:29px 0 30px;padding:0;gap:10px}.early-note h2{font-size:13px}.early-note p{font-size:11px}.site-footer{padding-block:20px;gap:16px;flex-wrap:wrap;font-size:10px}.domain{font-size:10px}.site-footer a{margin-inline-start:auto}.site-footer .domain{width:100%;margin:0}html[dir="ltr"] h1{font-size:57px;line-height:1.25;letter-spacing:-2px}html[dir="ltr"] .hero-description{line-height:1.9}}
@media(max-width:374px){.page-shell{width:calc(100% - 32px)}h1{font-size:55px}.hero{padding-top:34px}.learning-scene{width:calc(100% - 16px)}.note-sheet{padding-inline:20px}.sheet-footer{font-size:8px}.preferences{gap:8px}.theme-control{gap:3px}.theme-control select{font-size:12px}html[dir="ltr"] h1{font-size:51px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.primary-link{transition:none}.primary-link:hover{transform:none}}
/* Keep the decorative orbital lines inside the viewport. */
body{overflow-x:clip}
.hero{overflow:clip}
@media(max-width:740px){.orbit-one{transform:none;inset:0 -5px 24px}.orbit-two{transform:none;inset:12px 12px 34px}}

/* Shared public pages. */
.site-nav{display:flex;flex-wrap:wrap;align-items:center;gap:8px 25px;padding:17px 0;border-bottom:1px solid var(--line);font-size:12px}
.site-nav a,.footer-nav a{padding:3px 0;text-decoration:none;text-underline-offset:7px;color:var(--muted)}
.site-nav a:hover,.footer-nav a:hover{color:var(--accent)}
.site-nav a[aria-current="page"],.footer-nav a[aria-current="page"]{color:var(--accent);text-decoration:underline;text-decoration-thickness:2px}
.footer-nav{display:flex;flex-wrap:wrap;gap:10px 26px;margin-bottom:23px;font-size:12px}
.footer-base{display:flex;gap:20px;align-items:center}
.document-page{max-width:840px;margin-inline:auto;padding:54px 0 52px}
.page-intro{padding-bottom:32px;border-bottom:1px solid var(--line);margin-bottom:34px}
.page-intro .section-label{font-size:12px;margin-bottom:14px}
.page-intro h1,html[dir="ltr"] .page-intro h1{font-size:clamp(29px,4vw,46px);line-height:1.65;letter-spacing:-.8px;font-weight:700;margin:0 0 16px;max-width:820px}
.page-summary{font-size:15px;line-height:2.1;color:var(--muted);max-width:720px;margin:0}
.copy-section{margin:0 0 30px}
.copy-section h2,.page-notice h2,.contact-form h2{font-size:20px;font-weight:650;line-height:1.8;margin:0 0 10px}
.copy-section p,.page-notice p{font-size:14px;line-height:2.2;margin:0 0 12px;color:var(--muted)}
.page-notice{padding:24px 26px;border:1px solid var(--line);border-inline-start:3px solid var(--coral);background:var(--paper);border-radius:6px;margin:32px 0}
.page-notice h2{color:var(--accent)}
.page-notice p:last-child{margin-bottom:0}
.page-updated{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:23px;margin:40px 0 0}
.text-link,.related-links a{color:var(--accent);font-size:13px;text-underline-offset:6px}
.related-links{display:flex;flex-wrap:wrap;gap:15px 25px}
.contact-layout{display:grid;grid-template-columns:1fr 1.15fr;gap:40px;align-items:start}
.contact-form{padding:24px;background:var(--paper);border:1px solid var(--line);border-radius:8px;min-width:0}
.contact-form .form-help,.contact-form .form-status{font-size:12px;line-height:2;color:var(--muted);margin:0 0 21px}
.contact-form .form-status{margin:15px 0 0;font-size:11px}
.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}
.form-row label{font-size:12px;font-weight:550}
.form-row input,.form-row textarea{width:100%;min-width:0;border:1px solid var(--line);border-radius:5px;background:var(--background);color:var(--ink);font:inherit;font-size:14px;line-height:1.9;padding:9px 11px}
.form-row textarea{resize:vertical;min-height:120px}
.form-row input:focus-visible,.form-row textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.contact-form button{font-size:12px;width:100%;min-height:47px;opacity:.55}
.contact-form button:hover{transform:none;background:var(--ink);color:var(--background);border-color:var(--ink)}
@media(max-width:740px){.site-nav{gap:8px 19px;padding:13px 0;font-size:11px}.footer-nav{gap:8px 21px;font-size:11px}.footer-base{flex-wrap:wrap;gap:10px}.footer-base .domain{width:auto;margin-inline-start:auto}.document-page{padding-top:32px;padding-bottom:32px}.page-intro{padding-bottom:25px;margin-bottom:26px}.page-intro h1,html[dir="ltr"] .page-intro h1{font-size:31px;line-height:1.7;letter-spacing:-.5px}.page-summary{font-size:13px}.copy-section h2,.page-notice h2,.contact-form h2{font-size:18px}.copy-section p,.page-notice p{font-size:13px;line-height:2.2}.page-notice{padding:20px}.contact-layout{grid-template-columns:1fr;gap:30px}.contact-form{padding:21px}.page-updated{margin-top:30px}}