:root {
  --coral: #ff6b6b;
  --coral-deep: #e85d5d;
  --orange: #ff8e53;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --paper: #f4f6f8;
  --white: #ffffff;
  --chip: #fff5f4;
  --radius: 18px;
  --page: 1120px;
  --article: 46rem;
  --toc: 250px;
  --header-h: 72px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(255, 107, 107, 0.12), transparent 50%),
    radial-gradient(900px 360px at 100% 0%, rgba(255, 142, 83, 0.1), transparent 46%),
    var(--paper);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.7;
}

a {
  color: var(--coral-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:focus-visible,
.lang a:focus-visible,
nav.links a:focus-visible,
.cta:focus-visible,
.card:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--ink);
  color: var(--white);
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 50;
}

.skip:focus {
  left: 8px;
}

.topbar {
  height: 4px;
  background: linear-gradient(90deg, var(--coral), var(--orange));
}

.wrap {
  width: min(var(--page), calc(100% - 32px));
  margin: 0 auto;
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: var(--header-h);
  padding: 12px 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px 20px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.03em;
  font-size: 1.05rem;
  white-space: nowrap;
}

.brand-block img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(232, 93, 93, 0.25);
}

nav.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

nav.links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 650;
  padding: 7px 11px;
  border-radius: 999px;
  line-height: 1.2;
}

nav.links a:hover,
nav.links a[aria-current="page"] {
  color: var(--ink);
  background: var(--chip);
}

.lang {
  display: flex;
  gap: 4px;
}

.lang a {
  text-decoration: none;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 9px;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--white);
}

.lang a[aria-current="true"] {
  color: var(--white);
  background: var(--ink);
  border-color: var(--ink);
}

.page {
  width: min(var(--page), calc(100% - 32px));
  margin: 28px auto 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}

body.has-toc .page {
  grid-template-columns: var(--toc) minmax(0, 1fr);
}

.article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 40px rgba(15, 23, 42, 0.04);
  padding: 36px 40px 56px;
  min-width: 0;
}

.doc-head {
  padding-bottom: 8px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.doc-head h1,
.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.doc-head h1::after {
  content: "";
  display: block;
  width: 52px;
  height: 4px;
  margin-top: 16px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--coral), var(--orange));
}

.lede {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 40rem;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 22px;
}

.toc {
  position: sticky;
  top: calc(var(--header-h) + 16px);
}

.toc-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 14px 16px;
}

.toc-panel summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.toc-panel summary::after {
  content: "▾";
  font-size: 0.85rem;
  color: var(--ink);
}

.toc-panel[open] summary::after {
  content: "▴";
}

.toc-panel summary::-webkit-details-marker {
  display: none;
}

.toc-panel nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 12px;
  max-height: calc(100vh - 180px);
  overflow: auto;
}

.toc-panel nav a {
  display: block;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.86rem;
  line-height: 1.35;
  padding: 7px 10px;
  border-radius: 10px;
}

.toc-panel nav a:hover {
  background: var(--chip);
  color: var(--coral-deep);
}

main.prose {
  max-width: var(--article);
}

main.prose h2 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.28rem;
  letter-spacing: -0.03em;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

main.prose h3 {
  margin: 1.5rem 0 0.45rem;
  font-size: 1.05rem;
}

main.prose p,
main.prose ul,
main.prose ol {
  margin: 0 0 1.05rem;
}

main.prose ul,
main.prose ol {
  padding-inline-start: 1.25rem;
}

main.prose li + li {
  margin-top: 0.4rem;
}

main.prose li::marker {
  color: var(--coral);
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 8px;
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  text-decoration: none;
  color: inherit;
  display: block;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: #fecaca;
  transform: translateY(-2px);
  color: inherit;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.cta {
  display: inline-block;
  margin: 8px 0 18px;
  padding: 12px 18px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--coral), var(--orange));
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(232, 93, 93, 0.28);
}

.cta:hover {
  color: var(--white);
  filter: brightness(0.97);
}

#site-footer {
  margin-top: 48px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.7);
}

#site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  align-items: center;
}

#site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

html[dir="rtl"] body {
  font-family: "Segoe UI", "Noto Naskh Arabic", "Amiri", Tahoma, sans-serif;
}

@media (max-width: 1024px) {
  body.has-toc .page {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .toc-panel nav {
    max-height: 240px;
    scrollbar-width: thin;
  }
}

@media (max-width: 860px) {
  .header-inner {
    grid-template-columns: 1fr auto;
    min-height: 0;
    padding: 10px 0 8px;
  }

  nav.links {
    order: 3;
    grid-column: 1 / -1;
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 2px;
    mask-image: linear-gradient(90deg, #000 88%, transparent);
  }

  nav.links::-webkit-scrollbar {
    display: none;
  }

  nav.links a {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  html[dir="rtl"] nav.links {
    mask-image: linear-gradient(to left, #000 88%, transparent);
  }

  .article {
    padding: 24px 20px 40px;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}

@media print {
  .topbar,
  #site-header,
  #site-footer,
  .toc,
  .skip,
  .cta {
    display: none !important;
  }

  body,
  .page,
  .article {
    width: auto;
    background: #fff;
    color: #000;
    box-shadow: none;
    border: 0;
    padding: 0;
  }
}