/* Content pages: lot size calculator, guides index, guides.
   Builds on rfx.css tokens; long-form reading column with a sticky contents list. */
.nav a[aria-current="page"] { color: var(--fg); }
.crumbs { padding-top: 22px; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; font-size: .85rem; color: var(--fg-3); }
.crumbs li + li::before { content: "›"; margin-inline-end: 6px; color: var(--fg-3); }
html[dir="rtl"] .crumbs li + li::before { content: "‹"; }
.crumbs a { color: var(--fg-2); text-decoration: none; }
.crumbs a:hover { color: var(--fg); }

/* ---------- page head */
.pg-head { padding-block: clamp(28px, 5vw, 56px) clamp(20px, 3vw, 32px); display: grid; gap: 14px; max-width: 820px; }
.pg-head h1 { font: 700 var(--step-4)/1.12 var(--f-display); margin: 0; text-wrap: balance; }
html[lang="fa"] .pg-head h1 { line-height: 1.35; font-weight: 800; }
.pg-head .lead { margin: 0; }

/* ---------- calculator */
.calc { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(18px, 3vw, 28px); align-items: start; padding-bottom: clamp(40px, 6vw, 72px); }
.calc-form, .calc-out { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: clamp(18px, 3vw, 26px); display: grid; gap: 16px; min-width: 0; }
.calc-out { position: sticky; top: 84px; border-color: #2f4f7a; background: linear-gradient(160deg, rgba(58, 134, 240, .1), var(--surface) 55%); }
.cf { display: grid; gap: 6px; }
.cf > span { font-weight: 600; font-size: .95rem; }
.cf small { color: var(--fg-3); font-size: .8rem; }
.cf-row { display: flex; gap: 8px; align-items: stretch; }
.cf input, .cf select { width: 100%; min-height: 46px; padding: 0 12px; border-radius: 9px; border: 1px solid var(--line-2); background: var(--bg-2); color: var(--fg); font: 600 1rem/1 var(--f-mono); direction: ltr; text-align: left; }
.cf select { font-family: var(--f-body); }
.cf input:focus, .cf select:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(58, 134, 240, .2); }
.cf-unit { display: grid; place-items: center; min-width: 54px; padding: 0 10px; border-radius: 9px; border: 1px solid var(--line-2); background: var(--bg); color: var(--fg-2); font: 600 .85rem/1 var(--f-mono); }
.seg2 { display: inline-flex; border: 1px solid var(--line-2); border-radius: 9px; overflow: hidden; flex: none; }
.seg2 button { min-width: 52px; border: 0; background: var(--bg); color: var(--fg-2); font: 600 .9rem/1 var(--f-mono); cursor: pointer; padding: 0 12px; }
.seg2 button[aria-pressed="true"] { background: var(--blue-soft); color: #cfe2ff; box-shadow: inset 0 -2px 0 var(--blue); }
.cf-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.out-lot { display: grid; gap: 2px; }
.out-lot span { color: var(--fg-3); font-size: .9rem; }
.out-lot b { font: 700 clamp(2.6rem, 2rem + 3vw, 3.8rem)/1 var(--f-mono); color: var(--fg); direction: ltr; text-align: start; }
.out-lot em { font-style: normal; color: var(--fg-2); font-size: .9rem; }
.out-grid { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.out-grid div { background: var(--bg-2); padding: 12px 14px; display: grid; gap: 3px; }
.out-grid dt { font-size: .78rem; color: var(--fg-3); }
.out-grid dd { margin: 0; font: 600 1.05rem/1.2 var(--f-mono); direction: ltr; text-align: start; }
.out-grid dd.neg { color: var(--sl); }
.out-warn { margin: 0; padding: 10px 12px; border-radius: 9px; border: 1px solid rgba(226, 178, 60, .5); background: rgba(42, 33, 16, .55); color: #ffe6a8; font-size: .88rem; }
.out-formula { margin: 0; padding: 10px 12px; border-radius: 9px; background: var(--bg); border: 1px dashed var(--line-2); font: 500 .82rem/1.6 var(--f-mono); color: var(--fg-2); direction: ltr; text-align: left; overflow-x: auto; }
.out-table { width: 100%; border-collapse: collapse; font: 500 .88rem/1.3 var(--f-mono); direction: ltr; }
.out-table th, .out-table td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; }
.out-table th { font: 600 .75rem/1 var(--f-body); color: var(--fg-3); text-transform: uppercase; letter-spacing: .04em; }
.out-table tr.is-cur td { color: #cfe2ff; background: rgba(58, 134, 240, .1); }
@media (max-width: 900px) { .calc { grid-template-columns: 1fr; } .calc-out { position: static; } }
@media (max-width: 520px) { .cf-2 { grid-template-columns: 1fr; } }

/* ---------- product call-to-action box */
.cta-box { margin-block: clamp(32px, 5vw, 56px); display: grid; grid-template-columns: auto 1fr auto; gap: 18px 24px; align-items: center; padding: clamp(18px, 3vw, 28px); border-radius: 16px; border: 1px solid rgba(226, 178, 60, .45); background: linear-gradient(135deg, rgba(226, 178, 60, .1), var(--surface) 60%); }
.cta-box svg { width: 52px; height: 52px; }
.cta-box h2, .cta-box h3 { margin: 0 0 6px; font-size: 1.25rem; }
.cta-box p { margin: 0; color: var(--fg-2); }
.cta-acts { display: flex; flex-wrap: wrap; gap: 10px; }
@media (max-width: 760px) { .cta-box { grid-template-columns: 1fr; } .cta-box svg { display: none; } }

/* ---------- long-form text */
.doc-grid { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); align-items: start; padding-bottom: 24px; }
.toc { position: sticky; top: 84px; display: grid; gap: 8px; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg-2); }
.toc b { font-size: .8rem; color: var(--fg-3); text-transform: uppercase; letter-spacing: .05em; }
html[lang="fa"] .toc b { text-transform: none; letter-spacing: 0; }
.toc ol { margin: 0; padding-inline-start: 18px; display: grid; gap: 6px; font-size: .88rem; }
.toc a { color: var(--fg-2); text-decoration: none; }
.toc a:hover { color: var(--fg); }
@media (max-width: 960px) { .doc-grid { grid-template-columns: 1fr; } .toc { position: static; } }
.prose-l { max-width: 70ch; color: var(--fg-2); font-size: 1.06rem; line-height: 1.85; min-width: 0; }
html[lang="fa"] .prose-l { line-height: 2.05; }
.prose-l > * + * { margin-top: 1.05em; }
.prose-l h2 { color: var(--fg); font: 700 var(--step-2)/1.3 var(--f-display); margin-top: 1.9em; scroll-margin-top: 90px; }
html[lang="fa"] .prose-l h2 { font-weight: 800; line-height: 1.5; }
.prose-l h3 { color: var(--fg); font-size: 1.15rem; margin-top: 1.5em; }
.prose-l strong { color: var(--fg); font-weight: 600; }
.prose-l a { color: #9cc5ff; text-underline-offset: 3px; }
.prose-l a:hover { color: #cfe2ff; }
.prose-l ul, .prose-l ol { padding-inline-start: 1.3em; display: grid; gap: .45em; }
.prose-l blockquote { margin-inline: 0; padding: 14px 18px; border-inline-start: 3px solid var(--gold); background: rgba(42, 33, 16, .45); border-radius: 0 10px 10px 0; color: #ffe6a8; }
html[dir="rtl"] .prose-l blockquote { border-radius: 10px 0 0 10px; }
.prose-l blockquote p { margin: 0; }
.prose-l code { font: 500 .9em/1 var(--f-mono); background: var(--surface); border: 1px solid var(--line); border-radius: 5px; padding: 2px 6px; color: var(--fg); direction: ltr; unicode-bidi: isolate; }
.prose-l pre { overflow-x: auto; padding: 14px 16px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; direction: ltr; text-align: left; }
.prose-l pre code { border: 0; padding: 0; background: none; font-size: .88rem; line-height: 1.7; }
.prose-l table { display: block; overflow-x: auto; border-collapse: collapse; font-size: .95rem; }
.prose-l th, .prose-l td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: start; white-space: nowrap; }
.prose-l th { color: var(--fg); font-weight: 600; background: var(--surface); }
.doc-meta { margin: 0; color: var(--fg-3); font-size: .88rem; }

/* related and index cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 16px; }
.card-l { display: grid; gap: 10px; align-content: start; padding: 20px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface); text-decoration: none; color: inherit; transition: border-color .2s, transform .2s; }
.card-l:hover { border-color: var(--blue); transform: translateY(-2px); }
.card-l small { font: 600 .74rem/1 var(--f-mono); color: var(--blue); letter-spacing: .05em; text-transform: uppercase; }
html[lang="fa"] .card-l small { font-family: var(--f-body); letter-spacing: 0; text-transform: none; }
.card-l h2, .card-l h3 { margin: 0; font-size: 1.12rem; line-height: 1.45; color: var(--fg); }
.card-l p { margin: 0; color: var(--fg-2); font-size: .94rem; }
.card-l.is-tool { border-color: rgba(47, 191, 127, .45); background: linear-gradient(160deg, rgba(47, 191, 127, .08), var(--surface) 60%); }
.card-l.is-tool small { color: var(--tp); }
.related { padding-block: 8px clamp(48px, 7vw, 80px); display: grid; gap: 18px; }
.related > h2 { font-size: var(--step-2); margin: 0; }
.faq-sec { padding-bottom: clamp(40px, 6vw, 72px); }
.faq-sec > h2 { font-size: var(--step-2); margin: 0 0 18px; }

html[lang="fa"] .toc ol, html[lang="fa"] .prose-l ol { list-style: persian; }

/* brand home */
.home-head h1 { max-width: 16ch; }
.prod { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(20px, 4vw, 44px); align-items: center; padding: clamp(20px, 3vw, 32px); border-radius: 18px; border: 1px solid #2f4f7a; background: linear-gradient(140deg, rgba(58, 134, 240, .12), var(--surface) 55%); }
.prod-txt { display: grid; gap: 14px; min-width: 0; }
.prod-tag { justify-self: start; font: 600 .8rem/1 var(--f-body); color: #9cc5ff; border: 1px solid rgba(58, 134, 240, .5); border-radius: 999px; padding: 6px 10px; }
.prod h2 { margin: 0; font: 700 var(--step-3)/1.2 var(--f-display); text-wrap: balance; }
html[lang="fa"] .prod h2 { font-weight: 800; line-height: 1.4; }
.prod p { margin: 0; color: var(--fg-2); }
.prod ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.prod li { display: grid; grid-template-columns: 16px 1fr; gap: 10px; color: var(--fg); }
.prod li::before { content: ""; width: 9px; height: 9px; margin-top: .6em; border-radius: 2px; background: var(--tp); }
.prod-img { display: block; border-radius: 12px; overflow: hidden; border: 1px solid var(--line-2); box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .8); }
.prod-img img { display: block; width: 100%; height: auto; }
.home-tools { padding-block: clamp(36px, 6vw, 64px) 8px; display: grid; gap: 18px; }
.home-tools > h2 { margin: 0; font-size: var(--step-2); }
.home-soon { margin-block: clamp(28px, 5vw, 48px) clamp(48px, 7vw, 80px); display: grid; grid-template-columns: auto 1fr; gap: 14px 20px; align-items: start; padding: 22px 24px; border-radius: 14px; border: 1px dashed var(--line-2); background: var(--bg-2); }
.home-soon h2 { margin: 0 0 6px; font-size: 1.2rem; }
.home-soon p { margin: 0; color: var(--fg-2); }
.soon-tag { font: 700 .78rem/1 var(--f-body); color: #1a1405; background: var(--gold); border-radius: 999px; padding: 7px 10px; }
@media (max-width: 900px) { .prod { grid-template-columns: 1fr; } .prod-img { order: -1; } }
@media (max-width: 520px) { .home-soon { grid-template-columns: 1fr; } .soon-tag { justify-self: start; } }

/* brand home: longer sections */
.home-sec { padding-top: clamp(44px, 7vw, 80px); }
.home-sec > h2 { margin: 0 0 18px; font-size: var(--step-2); }
.home-sub { margin: 28px 0 0; font-size: 1.15rem; }
.more { color: #9cc5ff; font-weight: 600; }
.mm { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(22px, 4vw, 48px); align-items: start; }
.mm-txt { display: grid; gap: 14px; }
.mm-txt h2 { margin: 0; font: 700 var(--step-3)/1.2 var(--f-display); text-wrap: balance; }
html[lang="fa"] .mm-txt h2 { font-weight: 800; line-height: 1.45; }
.mm-txt p { margin: 0; color: var(--fg-2); }
.mm-stats { margin: 0; display: grid; gap: 14px; padding: clamp(18px, 3vw, 24px); border-radius: 14px; border: 1px solid rgba(239, 91, 91, .4); background: linear-gradient(160deg, rgba(239, 91, 91, .08), var(--surface) 60%); }
.mm-stats figcaption { font-weight: 600; color: var(--fg); }
.mm-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mm-grid div { position: relative; display: grid; gap: 4px; padding: 12px 10px 14px; border-radius: 10px; background: var(--bg-2); border: 1px solid var(--line); overflow: hidden; }
.mm-grid span { font: 600 .82rem/1 var(--f-mono); color: var(--fg-3); }
html[lang="fa"] .mm-grid span { font-family: var(--f-body); }
.mm-grid b { font: 700 1.25rem/1.1 var(--f-mono); color: var(--sl); direction: ltr; text-align: start; }
html[lang="fa"] .mm-grid b { font-family: var(--f-body); }
.mm-grid i { position: absolute; inset: auto 0 0 0; height: 4px; background: var(--sl); opacity: .85; transform-origin: left; transform: scaleX(calc(var(--k) * .25)); }
.mm-stats p { margin: 0; color: var(--fg-2); font-size: .93rem; }
.pillars { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1100px) { .pillars { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .pillars { grid-template-columns: 1fr; } }
.who { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr)); gap: 12px; }
.who li { padding: 16px 18px; border-radius: var(--r); border: 1px solid var(--line); background: var(--surface); color: var(--fg-2); line-height: 1.7; }
.who b { color: var(--fg); }
.home-trust ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; max-width: 760px; }
.home-trust li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; color: var(--fg-2); }
.home-trust li::before { content: "✓"; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font: 700 .75rem/1 var(--f-mono); color: #0b2a18; background: var(--tp); margin-top: .2em; }
.home-trust p { margin: 14px 0 0; }
.home-sec .faq { max-width: 900px; }
@media (max-width: 900px) { .mm { grid-template-columns: 1fr; } }
@media (max-width: 480px) { .mm-grid { grid-template-columns: 1fr 1fr; } }

/* 404 */
.nf { padding-block: clamp(40px, 8vw, 96px); display: grid; gap: 16px; max-width: 760px; }
.nf .brand { margin-bottom: 12px; }
.nf-code { margin: 0; font: 700 clamp(3rem, 2rem + 6vw, 6rem)/1 var(--f-mono); color: var(--gold); }
.nf h1 { margin: 0; font: 700 var(--step-3)/1.2 var(--f-display); }
.nf-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.nf-links a { display: inline-block; padding: 10px 14px; border-radius: 9px; border: 1px solid var(--line-2); color: var(--fg); text-decoration: none; }
.nf-links a:hover { border-color: var(--blue); }
.nf-fa { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--line); display: grid; gap: 12px; font-family: "Vazirmatn", Tahoma, sans-serif; }
.nf-fa h2 { margin: 0; font-size: 1.4rem; }
.nf-fa p { margin: 0; color: var(--fg-2); }