:root {
  --bg: #f7f5ef;
  --surface: #fffefa;
  --surface-2: #eeece4;
  --ink: #17312e;
  --muted: #6b7773;
  --line: rgba(23, 49, 46, 0.12);
  --primary: #123b36;
  --accent: #edb64b;
  --mint: #dcece5;
  --shadow: 0 18px 50px rgba(25, 55, 50, 0.1);
  --sidebar: 258px;
}

body.dark {
  --bg: #102421;
  --surface: #17312e;
  --surface-2: #1d3936;
  --ink: #edf5ef;
  --muted: #b6c6c1;
  --line: rgba(238, 247, 242, 0.13);
  --primary: #dcece5;
  --mint: #254640;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Tajawal", Arial, sans-serif;
  line-height: 1.8;
}
button, input { font: inherit; }
button { cursor: pointer; }
.page-progress { position: fixed; z-index: 30; top: 0; right: 0; height: 3px; width: 0; background: var(--accent); }
.topbar {
  position: fixed; z-index: 20; top: 0; right: 0; left: 0; height: 72px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px);
}
.brand { display: flex; gap: 10px; color: var(--ink); text-decoration: none; align-items: center; line-height: 1.1; }
.brand small { display: block; color: var(--muted); margin-top: 4px; font-size: 11px; letter-spacing: 1px; }
.brand-mark { display: grid; width: 46px; height: 46px; padding: 5px; place-items: center; overflow: hidden; border-radius: 14px; background: #fff; box-shadow: 0 3px 10px rgba(23, 49, 46, .08); }
.brand-mark img { display: block; width: 100%; height: 100%; object-fit: contain; }
.top-actions { display: flex; gap: 8px; }
.header-links { display: flex; align-items: center; gap: 7px; margin-right: auto; margin-left: 18px; }
.header-links a { padding: 6px 9px; color: var(--ink); text-decoration: none; font-size: 13px; font-weight: 700; transition: .2s; }
.header-links a:hover { color: #c78d1d; }
.header-links .header-link { padding: 6px 13px; border: 1px solid var(--line); border-radius: 10px; }
.header-links .outline { color: var(--ink); background: var(--surface); }
.header-links .primary { border-color: var(--accent); color: #17312e; background: var(--accent); }
.mobile-login { display: none; align-items: center; padding: 5px 10px; border-radius: 9px; color: #17312e; background: var(--accent); text-decoration: none; font-size: 12px; font-weight: 800; }
.icon-btn { display: grid; width: 40px; height: 40px; place-items: center; border: 1px solid var(--line); border-radius: 12px; color: var(--ink); background: var(--surface); }
.mobile-only { display: none; }
.sidebar {
  position: fixed; z-index: 15; top: 72px; right: 0; bottom: 0; width: var(--sidebar);
  overflow-y: auto; padding: 18px 16px 30px; border-left: 1px solid var(--line); background: var(--surface);
}
.sidebar-head { display: flex; align-items: center; justify-content: space-between; padding: 2px 8px 12px; color: var(--muted); font-size: 13px; font-weight: 800; letter-spacing: .5px; }
.nav-group { margin-bottom: 14px; }
.nav-group-title { display: block; padding: 7px 8px; color: var(--muted); font-size: 12px; font-weight: 800; }
.nav-item { display: block; padding: 7px 10px; border-radius: 9px; color: var(--ink); text-decoration: none; font-size: 13px; transition: .2s; }
.nav-item:hover, .nav-item.active { color: #17312e; background: var(--mint); }
main { margin-right: var(--sidebar); }
.hero {
  display: grid; min-height: 560px; grid-template-columns: minmax(0, 1fr) 310px; gap: 32px;
  padding: 130px 7vw 72px; color: #f8fbf9; background: #123b36;
  background-image: radial-gradient(circle at 20% 10%, rgba(237,182,75,.2), transparent 20%), radial-gradient(circle at 85% 80%, rgba(107,169,151,.25), transparent 25%);
}
.eyebrow { display: block; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: 1px; }
h1 { margin: 12px 0 12px; font-size: clamp(42px, 6vw, 72px); line-height: 1.18; letter-spacing: -2px; }
h1 em { color: var(--accent); font-style: normal; }
.hero p { max-width: 670px; margin: 0 0 24px; color: rgba(248,251,249,.8); font-size: 17px; }
.search-box { display: flex; max-width: 720px; align-items: center; gap: 10px; padding: 5px 14px; border-radius: 15px; color: #17312e; background: #fff; box-shadow: 0 12px 30px rgba(0,0,0,.18); }
.search-box span { font-size: 25px; line-height: 1; }
.search-box input { width: 100%; padding: 10px 0; border: 0; outline: 0; color: #17312e; background: transparent; }
kbd { padding: 1px 7px; border: 1px solid #d8dedb; border-radius: 6px; color: #73807c; direction: ltr; font-size: 10px; white-space: nowrap; }
.hero-stats { display: flex; gap: 22px; margin-top: 20px; color: rgba(248,251,249,.75); font-size: 13px; }
.hero-stats strong { color: var(--accent); font-size: 19px; }
.hero-panel { align-self: center; padding: 19px; border: 1px solid rgba(255,255,255,.13); border-radius: 20px; background: rgba(255,255,255,.06); backdrop-filter: blur(10px); }
.panel-title { margin-bottom: 10px; color: var(--accent); font-size: 13px; font-weight: 800; }
.quick-link { display: flex; align-items: center; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.1); color: #fff; text-decoration: none; font-size: 14px; }
.quick-link:last-child { border-bottom: 0; }
.quick-link b { color: var(--accent); }
.knowledge-shell { max-width: 1320px; margin: auto; padding: 62px 5vw 90px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
h2 { margin: 3px 0 0; font-size: 32px; line-height: 1.35; }
.result-label { color: var(--muted); font-size: 13px; }
.category-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.pill { padding: 7px 13px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: var(--surface); font-size: 13px; }
.pill.active { border-color: var(--primary); color: var(--bg); background: var(--primary); }
.topics-grid { display: grid; gap: 14px; }
.topic-card { overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); box-shadow: 0 4px 18px rgba(23,49,46,.03); }
.topic-summary { display: flex; align-items: center; gap: 14px; padding: 18px 20px; cursor: pointer; list-style: none; }
.topic-summary::-webkit-details-marker { display: none; }
.topic-number { display: grid; width: 38px; height: 38px; flex: 0 0 auto; place-items: center; border-radius: 12px; color: #17312e; background: var(--mint); font-size: 12px; font-weight: 800; }
.topic-title { margin: 0; font-size: 18px; line-height: 1.3; }
.topic-meta { margin-top: 3px; color: var(--muted); font-size: 12px; }
.topic-arrow { margin-right: auto; color: var(--muted); transition: transform .2s; }
details[open] .topic-arrow { transform: rotate(180deg); }
.topic-body { padding: 4px 20px 22px 72px; border-top: 1px solid var(--line); }
.content-block { margin: 17px 0; }
.content-block h3 { margin: 22px 0 6px; color: var(--primary); font-size: 17px; }
.content-block p { margin: 0; color: var(--ink); white-space: pre-line; }
.screenshots { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin-top: 12px; }
.screenshot { overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-2); }
.screenshot img { display: block; width: 100%; height: 165px; object-fit: cover; cursor: zoom-in; transition: transform .2s; }
.screenshot:hover img { transform: scale(1.025); }
.empty-state { padding: 70px 20px; border: 1px dashed var(--line); border-radius: 18px; text-align: center; background: var(--surface); }
.empty-state span { color: var(--accent); font-size: 44px; }
.empty-state h3 { margin: 0; }
.empty-state p { margin: 0; color: var(--muted); }
.back-to-top { position: fixed; z-index: 10; bottom: 20px; left: 20px; display: none; width: 44px; height: 44px; border: 0; border-radius: 14px; color: #17312e; background: var(--accent); box-shadow: var(--shadow); font-size: 20px; }
.modal { position: fixed; z-index: 50; inset: 0; display: grid; padding: 4vw; place-items: center; background: rgba(0,0,0,.83); }
.modal[hidden] { display: none; }
.modal img { max-width: 95vw; max-height: 88vh; border-radius: 14px; background: #fff; box-shadow: 0 20px 70px rgba(0,0,0,.4); }
.modal-close { position: fixed; top: 20px; left: 24px; border: 0; color: #fff; background: transparent; font-size: 38px; }
@media (max-width: 920px) {
  .mobile-only { display: grid; }
  .mobile-login { display: flex; }
  .header-links { display: none; }
  .sidebar { transform: translateX(105%); transition: transform .25s; box-shadow: var(--shadow); }
  .sidebar.open { transform: translateX(0); }
  main { margin-right: 0; }
  .hero { grid-template-columns: 1fr; padding: 118px 6vw 58px; }
  .hero-panel { display: none; }
  .topic-body { padding: 2px 18px 18px; }
}
@media (max-width: 520px) {
  .topbar { padding: 0 16px; }
  h1 { font-size: 43px; }
  .hero-stats { gap: 14px; flex-wrap: wrap; }
  kbd { display: none; }
  .section-heading { align-items: start; flex-direction: column; gap: 4px; }
  h2 { font-size: 27px; }
  .topic-summary { padding: 15px; }
}