:root {
  --page: #f3eee3;
  --paper: #fffdf7;
  --paper-soft: #faf6ec;
  --ink: #1f241f;
  --muted: #6b7370;
  --line: #e3dbc9;
  --line-strong: #cfc3aa;
  --green: #12403a;
  --green-deep: #0c2f2a;
  --green-soft: rgba(18, 64, 58, .08);
  --gold: #b8863b;
  --gold-soft: #e9c986;
  --wine: #7a2f3d;
  --good: #1e6e4e;
  --warn: #a06a1f;
  --shadow: 0 18px 46px rgba(41, 33, 21, .10);
  --shadow-soft: 0 8px 24px rgba(41, 33, 21, .07);
  --radius: 12px;
  --radius-sm: 8px;
  --font-ui: "IBM Plex Sans Arabic", system-ui, -apple-system, "Segoe UI", Tahoma, Arial, sans-serif;
  --font-serif: "Amiri", "Noto Naskh Arabic", Georgia, serif;
  --topbar-ink: #fff;
}

[data-theme="dark"] {
  --page: #11150f;
  --paper: #1a201b;
  --paper-soft: #161c17;
  --ink: #e9e4d5;
  --muted: #a5ab9f;
  --line: #2b332c;
  --line-strong: #3b463d;
  --green: #143c35;
  --green-deep: #0d2925;
  --green-soft: rgba(233, 201, 134, .07);
  --gold: #d3a559;
  --gold-soft: #e9c986;
  --good: #58b98a;
  --warn: #d8a44c;
  --shadow: 0 18px 46px rgba(0, 0, 0, .45);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, .3);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(180deg, var(--green-soft), transparent 320px),
    var(--page);
  color: var(--ink);
  font-family: var(--font-ui);
  line-height: 1.6;
  transition: background-color .25s ease, color .25s ease;
}

a { color: inherit; }
button, input, select { font: inherit; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }

::selection { background: var(--gold-soft); color: #1f241f; }

.app-shell { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; }

/* ---------- Topbar ---------- */
.topbar {
  color: var(--topbar-ink);
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='56' viewBox='0 0 56 56'%3E%3Cg fill='none' stroke='%23e9c986' stroke-opacity='.10'%3E%3Cpath d='M28 4 34 22 52 28 34 34 28 52 22 34 4 28 22 22Z'/%3E%3Ccircle cx='28' cy='28' r='7'/%3E%3C/g%3E%3C/svg%3E"),
    linear-gradient(120deg, var(--green-deep), var(--green) 55%, #1a4a42);
  border-bottom: 3px solid var(--gold);
}

.topbar-inner {
  width: min(1320px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 560px);
  gap: 28px;
  align-items: center;
}

.brand { min-width: 0; }

.brand-kicker {
  margin: 0 0 2px;
  color: var(--gold-soft);
  font-size: 13px;
  letter-spacing: .4px;
}

.brand h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.15;
  font-weight: 700;
}

.brand-sub {
  margin: 6px 0 0;
  max-width: 680px;
  color: rgba(255, 255, 255, .78);
  font-size: 14px;
}

.topbar-tools {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-width: 0;
}

.global-search {
  min-height: 56px;
  min-width: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 999px;
  background: rgba(255, 255, 255, .10);
  box-shadow: 0 12px 26px rgba(0, 0, 0, .14);
  backdrop-filter: blur(4px);
  transition: border-color .2s ease, background .2s ease;
}

.global-search:focus-within {
  border-color: var(--gold-soft);
  background: rgba(255, 255, 255, .16);
}

.search-symbol {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--gold-soft);
}

.global-search input {
  border: 0;
  background: transparent;
  color: #fff;
  outline: none;
  min-width: 0;
}

.global-search input::placeholder { color: rgba(255, 255, 255, .55); }

.global-search button {
  border: 0;
  border-radius: 999px;
  padding: 9px 22px;
  background: linear-gradient(135deg, var(--gold-soft), var(--gold));
  color: #2a1e08;
  font-weight: 700;
  transition: transform .15s ease, box-shadow .15s ease;
}

.global-search button:hover { transform: translateY(-1px); box-shadow: 0 6px 14px rgba(0, 0, 0, .25); }

.theme-toggle {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 50%;
  background: rgba(255, 255, 255, .10);
  color: var(--gold-soft);
  transition: background .2s ease;
}

.theme-toggle:hover { background: rgba(255, 255, 255, .2); }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- Layout ---------- */
.workspace {
  width: min(1320px, calc(100% - 32px));
  margin: 26px auto 40px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

/* ---------- Sidebar ---------- */
.library-board {
  position: sticky;
  top: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow-soft);
}

.board-section + .board-section {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
}

.board-title {
  margin: 2px 6px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: .5px;
}

.scholar-list, .topic-list { display: grid; gap: 8px; }

.scholar-btn, .topic-btn {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  width: 100%;
  padding: 11px 14px;
  text-align: right;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-soft);
  transition: border-color .2s ease, background .2s ease, transform .15s ease;
}

.scholar-btn:hover, .topic-btn:hover { border-color: var(--line-strong); transform: translateX(-2px); }

.scholar-btn.active, .topic-btn.active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.topic-btn { font-size: 13.5px; padding: 9px 14px; }
.topic-btn.active .scholar-count { background: rgba(255, 255, 255, .16); color: var(--gold-soft); }

.scholar-copy { display: grid; min-width: 0; }
.scholar-copy strong { font-size: 14px; line-height: 1.4; }

.scholar-count {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  background: var(--green-soft);
  border-radius: 999px;
  padding: 2px 10px;
}

.scholar-btn.active .scholar-count { background: rgba(255, 255, 255, .16); color: var(--gold-soft); }

/* ---------- Main column ---------- */
.main { display: grid; gap: 14px; min-width: 0; }

.resume-bar[hidden] { display: none; }

.resume-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 12px 16px;
  border: 1px dashed var(--gold);
  border-radius: var(--radius);
  background: var(--paper-soft);
  font-size: 14px;
}

.resume-bar strong { font-family: var(--font-serif); font-size: 16px; }

.resume-bar .resume-open {
  margin-inline-start: auto;
  border: 0;
  border-radius: 999px;
  padding: 7px 18px;
  background: var(--green);
  color: #fff;
  font-weight: 600;
  font-size: 13px;
}

.resume-bar .resume-dismiss {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 16px;
  padding: 4px 8px;
}

.scholar-head {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.scholar-head::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--gold), var(--green));
  border-start-start-radius: var(--radius);
  border-end-start-radius: var(--radius);
}

.scholar-head-top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
  justify-content: space-between;
}

.scholar-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.25;
}

.primary-link {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 7px 18px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: var(--green);
  background: var(--paper-soft);
  transition: background .2s ease, color .2s ease;
}

.primary-link:hover { background: var(--green); color: #fff; }

.head-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.metric {
  display: grid;
  gap: 0;
  min-width: 96px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-soft);
  text-align: center;
}

.metric strong { font-size: 22px; font-family: var(--font-serif); color: var(--green); line-height: 1.2; }
[data-theme="dark"] .metric strong { color: var(--gold); }
.metric span { font-size: 12px; color: var(--muted); }

/* ---------- Toolbar ---------- */
.toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
  padding: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  position: sticky;
  top: 16px;
  z-index: 5;
}

.toolbar-search {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-soft);
  color: var(--muted);
  transition: border-color .2s ease;
}

.toolbar-search:focus-within { border-color: var(--gold); }

.toolbar-search input {
  border: 0;
  background: transparent;
  outline: none;
  padding: 10px 0;
  min-width: 0;
}

.toolbar select,
.toolbar > button {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-soft);
  padding: 10px 14px;
}

.toolbar > button {
  display: grid;
  place-items: center;
  min-width: 44px;
  color: var(--muted);
}

.toolbar > button:hover { border-color: var(--gold); color: var(--gold); }

/* ---------- Agent panel ---------- */
.agent-panel { display: none; }

.agent-panel.active {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-inline-start: 4px solid var(--gold);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.agent-avatar {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green), var(--green-deep));
  color: var(--gold-soft);
  font-size: 12px;
  font-weight: 800;
}

.agent-content strong { font-size: 14px; }
.agent-content p { margin: 4px 0 8px; font-size: 14px; color: var(--muted); }

.agent-chips { display: flex; flex-wrap: wrap; gap: 6px; }

.agent-chip {
  font-size: 12px;
  padding: 3px 12px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  color: var(--ink);
}

.agent-close {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 18px;
  line-height: 1;
  padding: 2px 6px;
}

.results-count { margin: 0 4px; font-size: 13px; color: var(--muted); }

/* ---------- Book cards ---------- */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 14px;
}

.book-card {
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 10px;
  padding: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--green);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.book-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--line-strong);
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.badge {
  font-size: 11.5px;
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  background: var(--paper-soft);
}

.fav-btn {
  margin-inline-start: auto;
  border: 0;
  background: transparent;
  font-size: 21px;
  line-height: 1;
  color: var(--line-strong);
  min-width: 36px;
  min-height: 32px;
  padding: 2px 4px;
  transition: transform .15s ease, color .15s ease;
}

.fav-btn:hover { transform: scale(1.2); color: var(--gold); }
.fav-btn.on { color: var(--gold); }

.book-card h3 {
  margin: 4px 0 0;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.45;
  font-weight: 700;
}

.meta-row { margin-top: 6px; }

.actions {
  display: grid;
  grid-template-columns: 1fr;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.actions button {
  display: grid;
  place-items: center;
  min-height: 44px;
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid var(--green);
  background: var(--green);
  color: #fff;
  transition: background .15s ease;
}

.actions button:hover { background: var(--green-deep); }

.empty {
  grid-column: 1 / -1;
  padding: 48px 20px;
  text-align: center;
  color: var(--muted);
  background: var(--paper);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  font-size: 15px;
}

.load-more { display: grid; place-items: center; padding: 8px 0 4px; }

.load-more button {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 11px 34px;
  background: var(--paper);
  font-weight: 600;
  box-shadow: var(--shadow-soft);
  transition: background .2s ease, color .2s ease;
}

.load-more button:hover { background: var(--green); border-color: var(--green); color: #fff; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-soft);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  padding: 18px 16px;
}

.site-footer p { margin: 0; }

/* ---------- Reader dialog ---------- */
#readerDialog {
  width: min(1080px, calc(100vw - 24px));
  height: min(88vh, 1000px);
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow);
}

#readerDialog::backdrop { background: rgba(12, 20, 16, .6); backdrop-filter: blur(3px); }

.reader { display: grid; grid-template-rows: auto 1fr; height: 100%; }

.reader-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-soft);
}

.reader-head strong { font-family: var(--font-serif); font-size: 17px; }

.reader-actions { display: flex; gap: 8px; align-items: center; }

.reader-actions button {
  border: 0;
  background: var(--green);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 14px;
}

.reader-frame { width: 100%; height: 100%; border: 0; background: #525659; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: max(22px, env(safe-area-inset-bottom));
  inset-inline-start: max(22px, env(safe-area-inset-left));
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-size: 18px;
  box-shadow: var(--shadow);
  z-index: 20;
}

.back-to-top:hover { background: var(--green-deep); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .topbar-inner { grid-template-columns: 1fr; gap: 16px; padding: 20px 0; }
  .workspace { grid-template-columns: minmax(0, 1fr); margin-top: 18px; }

  .library-board { position: static; min-width: 0; }

  .board-section + .board-section {
    margin-top: 12px;
    padding-top: 10px;
  }

  .scholar-list, .topic-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }

  .scholar-btn, .topic-btn {
    flex: 0 0 auto;
    width: auto;
    grid-template-columns: minmax(0, 1fr);
    padding: 9px 14px;
    white-space: nowrap;
  }

  .scholar-count { display: none; }

  .toolbar { grid-template-columns: minmax(0, 1fr) auto; position: static; }
  .toolbar-search { grid-column: 1 / -1; min-height: 44px; }

  #readerDialog {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    max-width: 100vw;
    max-height: 100vh;
    max-height: 100dvh;
    margin: 0;
    border: 0;
    border-radius: 0;
  }

  .reader-head { padding-top: max(12px, env(safe-area-inset-top)); }
}

@media (max-width: 520px) {
  .books-grid { grid-template-columns: 1fr; }
  .head-metrics .metric { flex: 1; min-width: 72px; padding: 6px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}