/* دليل مسار — ورقة دفتر مدرسي: حبر أزرق، هامش أحمر، قلم تحديد أصفر */
:root {
  --paper: #F6F8FC;
  --sheet: #FFFFFF;
  --ink: #1B2A6B;
  --link: #2A45C2;
  --rule: #D8E1F1;
  --red: #C8322B;
  --marker: #FFE36E;
  --text: #1D2131;
  --muted: #586079;

  --f-body: "IBM Plex Sans Arabic", "Segoe UI", Tahoma, sans-serif;
  --f-head: "Reem Kufi", "IBM Plex Sans Arabic", Tahoma, sans-serif;
  --line: 2rem;               /* المسافة بين سطور الدفتر */
  --radius: 6px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 1rem; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 400 1.0625rem/1.9 var(--f-body);
}
img { max-width: 100%; height: auto; }
a { color: var(--link); text-underline-offset: .2em; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; border-radius: 2px; }
bdi[dir="ltr"] { font-family: var(--f-body); unicode-bidi: isolate; }

.wrap { width: min(100% - 2rem, 1080px); margin-inline: auto; }
.sr, .hp { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; inset-inline-start: 1rem; top: -4rem; background: var(--ink); color: #fff; padding: .5rem 1rem; z-index: 10; }
.skip:focus { top: .5rem; }

/* ---------- الشريط الرسمي ---------- */
.notice {
  margin: 0;
  padding: .45rem 1rem;
  background: var(--ink);
  color: #E6EBFA;
  font-size: .875rem;
  line-height: 1.6;
  text-align: center;
}
.notice a { color: #fff; font-weight: 600; }

/* ---------- الرأسية ---------- */
.masthead { background: var(--sheet); border-bottom: 1px solid var(--rule); }
.masthead-in { display: flex; align-items: center; gap: 1rem; min-height: 4.25rem; }
.brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); }
.brand span { font: 700 1.3rem/1.1 var(--f-head); display: grid; }
.brand small { font: 500 .75rem/1.4 var(--f-body); color: var(--muted); }
.site-nav { margin-inline-start: auto; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: .25rem; flex-wrap: wrap; }
.site-nav a {
  display: block; padding: .35rem .7rem; border-radius: var(--radius);
  color: var(--text); text-decoration: none; font-weight: 500; font-size: .95rem;
}
.site-nav a:hover { background: var(--paper); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -3px 0 var(--marker); }
.menu-btn { display: none; }

@media (max-width: 860px) {
  .menu-btn {
    display: block; margin-inline-start: auto;
    font: 600 .95rem var(--f-body); color: var(--ink);
    background: none; border: 1.5px solid var(--ink); border-radius: var(--radius); padding: .35rem .9rem; cursor: pointer;
  }
  .site-nav { display: none; flex-basis: 100%; margin: 0; padding-bottom: .75rem; }
  .site-nav.open { display: block; }
  .masthead-in { flex-wrap: wrap; }
  .site-nav ul { flex-direction: column; }
  .site-nav a { padding: .6rem .5rem; }
}

/* ---------- البطل: صفحة دفتر ---------- */
.hero {
  background-color: var(--sheet);
  background-image: repeating-linear-gradient(to bottom, transparent 0 calc(var(--line) - 1px), var(--rule) calc(var(--line) - 1px) var(--line));
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.hero::before {                     /* الهامش الأحمر */
  content: ""; position: absolute; top: 0; bottom: 0;
  inset-inline-start: max(1rem, calc((100% - 1080px) / 2 - 1.25rem));
  width: 2px; background: var(--red); opacity: .55;
}
.hero-in {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 3rem; align-items: center;
  padding-block: 3.5rem 4rem;
  padding-inline-start: 1.25rem;
}
.hero h1 {
  font: 700 clamp(1.9rem, 1.2rem + 2.6vw, 2.9rem)/1.35 var(--f-head);
  color: var(--ink); margin: 0 0 1rem; text-wrap: balance;
}
.lede { font-size: 1.15rem; color: var(--text); max-width: 60ch; }
.hero .lede { margin: 0; }

.builder {
  background: var(--sheet);
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 6px 6px 0 var(--ink);
}
.builder label, .builder-label { display: block; font-weight: 600; color: var(--ink); margin: 0 0 .35rem; }
.builder input {
  width: 100%; font: 500 1.35rem/1.4 var(--f-body); letter-spacing: .06em;
  padding: .6rem .8rem; color: var(--ink);
  border: 1.5px solid var(--rule); border-radius: var(--radius); background: var(--paper);
  text-align: left;
}
.builder input:focus { border-color: var(--link); outline: none; box-shadow: 0 0 0 3px rgba(42,69,194,.2); }
.builder-hint { margin: .35rem 0 1.25rem; font-size: .9rem; color: var(--muted); line-height: 1.6; }
.builder-hint.bad { color: var(--red); }
.builder-hint.good { color: #1E7A45; }
.builder-out {
  margin: 0 0 1.25rem; font-size: clamp(1.25rem, 1rem + 1.4vw, 1.75rem); font-weight: 600; color: var(--ink);
  overflow-wrap: anywhere; text-align: left; direction: ltr;
}
.builder-out bdi {
  background: linear-gradient(transparent 55%, var(--marker) 55% 92%, transparent 92%);
  padding: 0 .15em;
}
.builder-out.empty bdi { color: #9AA3BC; background: none; }
.builder-actions { display: flex; flex-wrap: wrap; gap: .6rem; }
.builder-privacy { margin: 1rem 0 0; font-size: .85rem; line-height: 1.6; color: var(--muted); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font: 600 1rem/1 var(--f-body); padding: .8rem 1.2rem; border-radius: var(--radius);
  background: var(--ink); color: #fff; border: 1.5px solid var(--ink); text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--link); border-color: var(--link); color: #fff; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--paper); color: var(--ink); border-color: var(--ink); }

@media (max-width: 860px) {
  .hero-in { grid-template-columns: 1fr; gap: 2rem; padding-block: 2.25rem 2.75rem; }
  .builder { box-shadow: 4px 4px 0 var(--ink); }
}

/* ---------- المقال ---------- */
.page { padding-block: 2.5rem 4rem; }
.doc { max-width: 72ch; }
.doc h1 { font: 700 clamp(1.75rem, 1.2rem + 2vw, 2.4rem)/1.35 var(--f-head); color: var(--ink); margin: .5rem 0 .25rem; text-wrap: balance; }
.doc h2 { font: 700 1.5rem/1.45 var(--f-head); color: var(--ink); margin: 2.75rem 0 .75rem; }
.doc h3 { font: 600 1.15rem/1.5 var(--f-body); color: var(--ink); margin: 1.75rem 0 .5rem; }
.doc p, .doc ul, .doc ol { margin: 0 0 1.1rem; }
.doc ul { padding-inline-start: 1.25rem; }
.doc li { margin-bottom: .4rem; }
.doc li::marker { color: var(--link); }
.updated { font-size: .875rem; color: var(--muted); margin-bottom: 1.25rem !important; }

.crumbs { font-size: .875rem; color: var(--muted); display: flex; gap: .5rem; flex-wrap: wrap; }
.crumbs a { color: var(--muted); }

/* خطوات مرقمة: تسلسل فعلي */
.steps { list-style: none; padding: 0 !important; counter-reset: s; }
.steps > li {
  counter-increment: s; position: relative;
  padding-inline-start: 3rem; margin-bottom: 1rem !important; min-height: 2.25rem;
}
.steps > li::before {
  content: counter(s);
  position: absolute; inset-inline-start: 0; top: .1rem;
  width: 2.1rem; height: 2.1rem; border-radius: 50%;
  border: 1.5px solid var(--ink); color: var(--ink);
  display: grid; place-items: center; font: 700 1rem/1 var(--f-body);
}
.steps p { margin: 0; }

.checklist { list-style: none; padding: 0 !important; }
.checklist li { padding-inline-start: 1.75rem; position: relative; }
.checklist li::before {
  content: ""; position: absolute; inset-inline-start: 0; top: .6rem;
  width: .8rem; height: .8rem; border: 1.5px solid var(--ink); border-radius: 2px;
}

.tip, .warn {
  padding: .9rem 1.1rem; border-radius: var(--radius);
  border-inline-start: 4px solid; line-height: 1.75;
}
.tip { background: #FFF9D9; border-color: #E8C400; }
.warn { background: #FCEDEC; border-color: var(--red); }

.formula {
  background: var(--sheet); border: 1px dashed var(--ink); border-radius: var(--radius);
  padding: .8rem 1rem; text-align: center; font-weight: 600; color: var(--ink); overflow-x: auto;
}

.table-wrap { overflow-x: auto; margin: 0 0 1.25rem; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--sheet); }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { padding: .7rem .9rem; text-align: start; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { background: var(--paper); color: var(--ink); font-weight: 600; }
tbody tr:last-child td { border-bottom: 0; }
a.off { word-break: break-word; }

.toc { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--radius); padding: 1rem 1.25rem; margin-bottom: 1.5rem; }
.toc ul { margin: 0 !important; columns: 2 16rem; }

/* قسم الفرنسية */
.fr {
  margin-top: 2.75rem; padding: 1.25rem 1.5rem; background: var(--sheet);
  border: 1px solid var(--rule); border-radius: var(--radius); line-height: 1.75;
}
.fr h2 { margin-top: 0 !important; font-family: var(--f-body); font-size: 1.3rem !important; }
.fr p { margin: 0; }

/* الأسئلة الشائعة */
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary {
  cursor: pointer; padding: .9rem 0; font-weight: 600; color: var(--ink); list-style: none;
  display: flex; justify-content: space-between; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.3rem; line-height: 1; color: var(--link); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 1rem; color: var(--text); }

/* روابط ذات صلة */
.related { max-width: 72ch; margin-top: 3rem; padding-top: 1.5rem; border-top: 2px solid var(--ink); }
.related h2 { font: 700 1.25rem/1.4 var(--f-head); color: var(--ink); margin: 0 0 .75rem; }
.related ul { list-style: none; margin: 0; padding: 0; }
.related li { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .25rem 1rem; padding: .65rem 0; border-bottom: 1px solid var(--rule); }
.related a { font-weight: 600; text-decoration: none; }
.related a:hover { text-decoration: underline; }
.related span { color: var(--muted); font-size: .9rem; }

/* ---------- الحاسبة ---------- */
.calc { background: var(--sheet); border: 1.5px solid var(--ink); border-radius: var(--radius); padding: 1.25rem; margin: 1.5rem 0 2rem; }
.tabs { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1.25rem; }
.tabs button {
  font: 600 .95rem var(--f-body); padding: .5rem .9rem; border-radius: var(--radius);
  border: 1.5px solid var(--rule); background: var(--paper); color: var(--text); cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); gap: 1rem; }
.fields label, .coef-table { font-weight: 600; color: var(--ink); }
.fields label span { font-weight: 400; color: var(--muted); font-size: .85rem; margin-inline-start: .35rem; }
.calc input, .form input, .form textarea {
  display: block; width: 100%; margin-top: .3rem;
  font: 500 1.1rem/1.4 var(--f-body); padding: .55rem .7rem;
  border: 1.5px solid var(--rule); border-radius: var(--radius); background: var(--paper); color: var(--text);
}
.calc input:focus, .form input:focus, .form textarea:focus { outline: none; border-color: var(--link); box-shadow: 0 0 0 3px rgba(42,69,194,.2); }
.calc input[aria-invalid="true"] { border-color: var(--red); }
.coef-table th, .coef-table td { padding: .4rem; border: 0; background: none; }
.coef-table input { margin: 0; }
.coef-table td:nth-child(2), .coef-table td:nth-child(3) { width: 6.5rem; }
.coef-table .del { background: none; border: 0; color: var(--red); font-size: 1.3rem; cursor: pointer; padding: .3rem .5rem; }
.panel .btn-ghost { margin-top: .5rem; }
.result { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px dashed var(--rule); text-align: center; }
.result-label { margin: 0; color: var(--muted); font-size: .9rem; }
.result-num { margin: .1rem 0; font: 700 3rem/1.2 var(--f-body); color: var(--ink); }
.result-note { margin: 0; color: var(--muted); }

/* ---------- النموذج ---------- */
.form { display: grid; gap: 1rem; max-width: 34rem; margin-bottom: 1.5rem; }
.form label { font-weight: 600; color: var(--ink); }
.form .btn { justify-self: start; }
.form-ok { background: #E8F5EC; border-inline-start: 4px solid #1E7A45; padding: .8rem 1rem; }
.form-err { background: #FCEDEC; border-inline-start: 4px solid var(--red); padding: .5rem 1rem; }
.form-err ul { margin: 0; }

/* ---------- التذييل ---------- */
.footer { background: var(--ink); color: #D6DCF3; padding-top: 2.5rem; font-size: .95rem; line-height: 1.8; }
.footer a { color: #fff; }
.footer-in { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; }
.footer-brand { font: 700 1.3rem var(--f-head); color: #fff; margin: 0 0 .5rem; }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: .35rem; }
.copy { border-top: 1px solid rgba(255,255,255,.15); margin-top: 2rem; padding-block: 1rem; font-size: .85rem; color: #AEB7DA; }
@media (max-width: 760px) { .footer-in { grid-template-columns: 1fr; gap: 1.25rem; } }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }
@media print { .notice, .masthead, .footer, .related, .builder-actions { display: none; } }