:root {
  --bg:        #0a1410;
  --bg-2:      #0e1c17;
  --panel:     rgba(18, 38, 30, 0.55);
  --panel-2:   rgba(24, 51, 41, 0.85);
  --border:    rgba(205, 162, 80, 0.18);
  --border-2:  rgba(205, 162, 80, 0.42);

  --ink:       #eef3f0;
  --ink-2:     #b3c5bc;
  --ink-3:     #6e857c;

  --gold:      #cda250;
  --gold-2:    #e0b869;
  --teal:      #1ec79f;
  --teal-2:    #25e6b8;

  --font-ui:   'Inter', -apple-system, system-ui, sans-serif;
  --font-ar:   'Amiri', 'Scheherazade New', 'Times New Roman', serif;

  --radius:    14px;
  --shadow-lg: 0 18px 50px rgba(0,0,0,0.45);
  --shadow-sm: 0 4px 14px rgba(0,0,0,0.25);

  --sidebar-w: 280px;
  --card-w:    360px;
  --ease:      cubic-bezier(.4,0,.2,1);

  /* Arabic body text size. Adjusted via the +ع / −ع buttons; persists in
     localStorage as ar:fontsize. Range 16–34 px in 2-px steps. */
  --ar-font-size: 22px;
  --ar-line-h:    2.1;
}

[data-theme="light"] {
  --bg:        #f6f9f7;
  --bg-2:      #ecf3ef;
  --panel:     rgba(255,255,255,0.85);
  --panel-2:   #ffffff;
  --border:    rgba(160, 120, 40, 0.18);
  --border-2:  rgba(160, 120, 40, 0.4);

  --ink:       #131f1a;
  --ink-2:     #4d645a;
  --ink-3:     #87998f;

  --gold:      #a87a26;
  --gold-2:    #835a14;
  --teal:      #0d8b6e;
  --teal-2:    #086f57;

  --shadow-lg: 0 18px 50px rgba(20,40,30,0.10);
  --shadow-sm: 0 4px 14px rgba(20,40,30,0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  transition: background .25s var(--ease), color .25s var(--ease);
}

body.sidebar-collapsed { grid-template-columns: 0 1fr; }
body.sidebar-collapsed .sidebar { transform: translateX(-100%); }

/* ------------------------------------------------------------------ Sidebar */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: linear-gradient(180deg, var(--bg-2), var(--bg));
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform .25s var(--ease);
}

.brand {
  display: flex; gap: 12px; align-items: center;
  padding: 22px 20px 16px;
  border-bottom: 1px solid var(--border);
}
.brand-mark {
  display: grid; place-items: center;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--gold), #8b6720);
  color: #1a1208;
  font-family: var(--font-ar);
  font-size: 24px;
  box-shadow: 0 4px 18px rgba(205,162,80,0.25);
}
.brand-name { font-weight: 700; letter-spacing: .2px; }
.brand-sub  { color: var(--ink-3); font-size: 12px; }

.search-wrap { padding: 14px 18px; }
#search-input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--ink);
  border-radius: 10px;
  padding: 9px 12px;
  font: inherit;
  outline: none;
  transition: border-color .15s var(--ease);
}
#search-input::placeholder { color: var(--ink-3); }
#search-input:focus { border-color: var(--border-2); }

.chapter-nav {
  flex: 1;
  overflow-y: auto;
  padding: 4px 10px 14px;
}
.chapter-nav::-webkit-scrollbar { width: 6px; }
.chapter-nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }

.chap-group-title {
  padding: 14px 10px 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.4px;
  color: var(--gold);
}

.chap-item {
  display: block;
  padding: 9px 12px;
  margin: 2px 0;
  border-radius: 8px;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14px;
  cursor: pointer;
  transition: background .12s, color .12s;
  border: 1px solid transparent;
}
.chap-item:hover { background: var(--panel); color: var(--ink); }
.chap-item.active {
  background: var(--panel-2);
  color: var(--ink);
  border-color: var(--border-2);
}
.chap-item .ar {
  font-family: var(--font-ar);
  font-size: 13px;
  color: var(--ink-3);
  margin-top: 2px;
  direction: rtl;
  text-align: right;
}
.chap-item.active .ar { color: var(--gold-2); }

.sidebar-foot {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}
.muted   { color: var(--ink-3); }
.small   { font-size: 12px; }
.xsmall  { font-size: 11px; margin-top: 2px; }

/* ------------------------------------------------------------------- Reader */
.reader {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 100vh;
}

.reader-head {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 14px 28px;
  background: rgba(10,20,16,0.85);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--border);
}
[data-theme="light"] .reader-head {
  background: rgba(246,249,247,0.85);
}

.title-block { flex: 1; min-width: 0; }
.title-block h1 {
  font-size: 17px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.title-ar {
  font-family: var(--font-ar);
  color: var(--gold);
  font-size: 15px;
  direction: rtl;
  text-align: left;
  margin-top: 2px;
}

.head-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  display: grid; place-items: center;
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink-2);
  border-radius: 9px;
  cursor: pointer;
  transition: color .12s, border-color .12s;
}
.icon-btn:hover { color: var(--ink); border-color: var(--border-2); }

.font-size-switch {
  display: flex;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 9px;
  overflow: hidden;
}
.fs-btn {
  min-width: 40px;
  height: 36px;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  font: 500 14px/1 var(--font-ui);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1px;
  transition: background .12s, color .12s;
}
.fs-btn:hover { color: var(--gold); background: rgba(205,162,80,0.08); }
.fs-btn:active { background: rgba(205,162,80,0.18); }
.fs-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.fs-btn + .fs-btn { border-left: 1px solid var(--border); }

.view-switch {
  display: flex;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 9px;
  overflow: hidden;
}
.vs-btn {
  width: 36px; height: 36px;
  border: 0; background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  font-size: 15px;
  font-family: var(--font-ar);
  transition: background .12s, color .12s;
}
.vs-btn:hover { color: var(--ink); }
.vs-btn.active {
  background: linear-gradient(180deg, rgba(205,162,80,0.18), rgba(205,162,80,0.05));
  color: var(--gold);
}

.reader-body {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 28px 80px;
}
.loading { color: var(--ink-3); text-align: center; padding: 80px 0; }

/* ----- Paragraph layouts -------------------------------------------------- */
.para {
  display: grid;
  gap: 18px;
  margin-bottom: 28px;
  padding-bottom: 26px;
  border-bottom: 1px dashed var(--border);
}
.para:last-child { border-bottom: 0; }

.reader-body[data-view="split"]   .para { grid-template-columns: 1fr 1fr; }
.reader-body[data-view="stacked"] .para { grid-template-columns: 1fr; }
.reader-body[data-view="ar-only"] .para { grid-template-columns: 1fr; }
.reader-body[data-view="uz-only"] .para { grid-template-columns: 1fr; }

.reader-body[data-view="ar-only"] .col-uz,
.reader-body[data-view="uz-only"] .col-ar { display: none; }

.col-uz, .col-ar {
  padding: 4px;
  font-size: 17px;
  line-height: 1.85;
}
.col-uz { color: var(--ink); }
.col-ar {
  font-family: var(--font-ar);
  font-size: var(--ar-font-size);
  line-height: var(--ar-line-h);
  direction: rtl;
  text-align: justify;
  color: var(--ink);
  transition: font-size .15s var(--ease);
}
.reader-body[data-view="ar-only"] .col-ar {
  font-size: calc(var(--ar-font-size) + 4px);
}

/* Sentence pairing: hover highlight links Arabic ↔ Uzbek halves */
.sent.hover { background: rgba(30,199,159,0.10); border-radius: 6px; }

/* Clickable Arabic word */
.w {
  cursor: pointer;
  padding: 0 1px;
  border-radius: 4px;
  transition: background .1s, color .1s;
}
.w:hover { background: rgba(205,162,80,0.15); color: var(--gold-2); }
.w.active { background: rgba(205,162,80,0.30); color: var(--gold-2); }

/* Footer */
.reader-foot {
  position: sticky;
  bottom: 0;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 28px;
  background: rgba(10,20,16,0.85);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--border);
}
[data-theme="light"] .reader-foot { background: rgba(246,249,247,0.85); }
.nav-btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--ink-2);
  padding: 9px 14px;
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
  transition: color .1s, border-color .1s;
}
.nav-btn:hover:not(:disabled) { color: var(--ink); border-color: var(--border-2); }
.nav-btn:disabled { opacity: .4; cursor: not-allowed; }
.progress-readout {
  flex: 1;
  text-align: center;
  color: var(--ink-3);
  font-size: 13px;
}

/* ----- Word card ---------------------------------------------------------- */
.word-card {
  position: fixed;
  top: 0; right: 0;
  width: var(--card-w);
  max-width: 92vw;
  height: 100vh;
  background: var(--panel-2);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-2);
  box-shadow: var(--shadow-lg);
  padding: 26px 24px;
  overflow-y: auto;
  z-index: 20;
  transform: translateX(0);
  transition: transform .25s var(--ease);
}
.word-card[hidden] { display: block !important; transform: translateX(100%); pointer-events: none; }
.close-card {
  position: absolute; top: 12px; right: 14px;
  width: 32px; height: 32px;
  background: transparent; border: 0;
  color: var(--ink-2);
  font-size: 22px; line-height: 1;
  cursor: pointer; border-radius: 8px;
}
.close-card:hover { background: var(--panel); color: var(--ink); }

.card-head { margin-top: 4px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.card-ar {
  font-family: var(--font-ar);
  font-size: 38px;
  direction: rtl;
  color: var(--gold);
  line-height: 1.4;
}
.card-uz {
  margin-top: 6px;
  font-size: 17px;
  color: var(--teal);
  font-weight: 500;
}

.card-grammar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 18px 0;
}
.card-grammar > div {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
}
.card-grammar dt {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ink-3);
}
.card-grammar dd {
  font-family: var(--font-ar);
  font-size: 18px;
  color: var(--ink);
  direction: rtl;
  text-align: right;
  margin-top: 2px;
}
.card-grammar dd[data-latin="1"] {
  font-family: var(--font-ui);
  direction: ltr;
  text-align: left;
  font-size: 14px;
}

.card-context { margin-top: 14px; }
.card-sent-ar {
  font-family: var(--font-ar);
  direction: rtl;
  text-align: right;
  font-size: 19px;
  line-height: 1.9;
  color: var(--ink);
  margin: 8px 0;
}
.card-sent-uz {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.7;
}

/* Search highlight in sidebar */
.chap-item.hidden { display: none; }

/* ----- Mobile ------------------------------------------------------------- */
@media (max-width: 880px) {
  body { display: block; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 84vw;
    max-width: 320px;
    z-index: 30;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  .reader { width: 100%; }
  .reader-body { padding: 20px 16px 80px; }
  .reader-body[data-view="split"] .para { grid-template-columns: 1fr; }
}