/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #0F0826;
  --bg2:          #130D30;
  --surface:      #1A1040;
  --surface2:     #221450;
  --primary:      #6D28D9;
  --primary-l:    #7C3AED;
  --primary-ll:   #8B5CF6;
  --accent:       #A78BFA;
  --accent-l:     #C4B5FD;
  --text:         #F5F3FF;
  --text-2:       #C4B5FD;
  --text-3:       #8B7BB8;
  --border:       rgba(139,92,246,.25);
  --border-l:     rgba(167,139,250,.15);
  --card-h:       64px;
  --header-h:     60px;
  --nav-h:        68px;
  --radius:       16px;
  --radius-sm:    10px;
  --shadow:       0 4px 24px rgba(109,40,217,.3);
  --shadow-sm:    0 2px 12px rgba(109,40,217,.2);
  --trans:        .18s ease;
  --safe-bottom:  env(safe-area-inset-bottom, 0px);
  --safe-top:     env(safe-area-inset-top, 0px);
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
}

[lang="ar"] body,
[lang="ar"] * { font-family: -apple-system, 'Geeza Pro', 'Arabic Typesetting', BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
svg { display: block; flex-shrink: 0; }
img { display: block; max-width: 100%; }

/* ─── App Shell ─── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* ─── Header ─── */
#app-header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 600px;
  height: calc(var(--header-h) + var(--safe-top));
  padding-top: var(--safe-top);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-inline: 16px;
  background: linear-gradient(180deg, #0F0826 80%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-l);
}

#header-brand {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}

.header-bolt {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  flex-shrink: 0;
  display: block;
  box-shadow: 0 0 10px rgba(109,40,217,.6);
}

#header-text {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -.01em;
}

.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-l);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: background var(--trans), color var(--trans);
  flex-shrink: 0;
}
.btn-icon:hover { background: var(--surface2); color: var(--text); }
.btn-icon svg { width: 20px; height: 20px; }

[dir="ltr"] #back-arrow { transform: scaleX(-1); }

.btn-lang {
  height: 34px;
  padding: 0 14px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .03em;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--border);
  transition: background var(--trans), color var(--trans);
  flex-shrink: 0;
}
.btn-lang:hover { background: var(--primary); color: #fff; }

/* ─── Main Content ─── */
#main-content {
  flex: 1;
  padding-top: calc(var(--header-h) + var(--safe-top) + 4px);
  padding-bottom: calc(var(--nav-h) + var(--safe-bottom) + 8px);
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* ─── Pages ─── */
.page {
  display: none;
  padding: 0 0 24px;
  animation: fadeIn .22s ease;
}
.page.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ─── Hero ─── */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 20px 24px;
  background: radial-gradient(ellipse 120% 80% at 50% 0%, rgba(109,40,217,.35) 0%, transparent 70%);
}

.hero-icon-wrap {
  width: 88px;
  height: 88px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-app-icon {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  box-shadow: 0 8px 32px rgba(109,40,217,.5);
  display: block;
}

.hero h1 {
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.02em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff 40%, var(--accent-l));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: .9rem;
  color: var(--text-2);
  max-width: 320px;
}

/* ─── Featured Button ─── */
.home-featured {
  padding: 12px 16px 8px;
}
.featured-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 18px;
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  text-decoration: none;
  color: #fff;
  box-shadow: 0 6px 24px rgba(109,40,217,.45);
  transition: transform .15s, box-shadow .15s;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.featured-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.12), transparent 60%);
  pointer-events: none;
}
.featured-btn:active {
  transform: scale(.97);
  box-shadow: 0 3px 12px rgba(109,40,217,.35);
}
.featured-btn-icon {
  font-size: 2rem;
  flex-shrink: 0;
  line-height: 1;
}
.featured-btn-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.featured-btn-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .01em;
}
.featured-btn-desc {
  font-size: .8rem;
  opacity: .82;
  font-weight: 400;
}
.featured-btn-arrow {
  font-size: 1.5rem;
  opacity: .7;
  flex-shrink: 0;
}
@media (min-width: 480px) {
  .home-featured { padding-inline: 20px; }
}

/* ─── Cards Grid ─── */
.cards-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 0 16px;
}

.card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform var(--trans), box-shadow var(--trans), background var(--trans);
  position: relative;
  overflow: hidden;
  min-height: 80px;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--trans);
}
.card:hover::before, .card:focus::before { opacity: 1; }
.card:active { transform: scale(.98); }
.card:focus { outline: 2px solid var(--accent); outline-offset: 2px; }

.card-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

.card-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.card-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.card-title {
  font-size: 1rem;
  font-weight: 700;
  display: block;
  line-height: 1.2;
}
.card-desc {
  font-size: .8rem;
  color: rgba(255,255,255,.65);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-chevron {
  font-size: 1.6rem;
  color: rgba(255,255,255,.4);
  line-height: 1;
  flex-shrink: 0;
  font-weight: 300;
  transition: transform var(--trans), color var(--trans);
}
.card:hover .card-chevron { color: rgba(255,255,255,.8); transform: translateX(-3px); }
[dir="ltr"] .card:hover .card-chevron { transform: translateX(3px); }

/* Card colour variants */
.c-courses {
  background: linear-gradient(135deg, rgba(109,40,217,.4) 0%, rgba(76,29,149,.25) 100%);
}
.c-courses::before { background: linear-gradient(135deg, rgba(109,40,217,.55), rgba(76,29,149,.4)); }
.c-courses .card-icon-box { background: rgba(109,40,217,.5); }

.c-enc {
  background: linear-gradient(135deg, rgba(5,150,105,.35) 0%, rgba(4,120,87,.2) 100%);
  border-color: rgba(16,185,129,.25);
}
.c-enc::before { background: linear-gradient(135deg, rgba(5,150,105,.5), rgba(4,120,87,.35)); }
.c-enc .card-icon-box { background: rgba(5,150,105,.4); }

.c-calc {
  background: linear-gradient(135deg, rgba(37,99,235,.35) 0%, rgba(29,78,216,.2) 100%);
  border-color: rgba(59,130,246,.25);
}
.c-calc::before { background: linear-gradient(135deg, rgba(37,99,235,.5), rgba(29,78,216,.35)); }
.c-calc .card-icon-box { background: rgba(37,99,235,.4); }

.c-labs {
  background: linear-gradient(135deg, rgba(217,70,239,.35) 0%, rgba(162,28,175,.2) 100%);
  border-color: rgba(232,121,249,.25);
}
.c-labs::before { background: linear-gradient(135deg, rgba(217,70,239,.5), rgba(162,28,175,.35)); }
.c-labs .card-icon-box { background: rgba(217,70,239,.4); }

.c-links {
  background: linear-gradient(135deg, rgba(245,158,11,.3) 0%, rgba(180,83,9,.2) 100%);
  border-color: rgba(251,191,36,.25);
}
.c-links::before { background: linear-gradient(135deg, rgba(245,158,11,.45), rgba(180,83,9,.3)); }
.c-links .card-icon-box { background: rgba(245,158,11,.35); }

/* ─── Install Banner ─── */
.install-banner {
  margin: 16px 16px 0;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(109,40,217,.4), rgba(76,29,149,.3));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.install-banner-content { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; }
.install-banner-icon { font-size: 22px; flex-shrink: 0; }
.install-banner-content p { font-size: .85rem; color: var(--text-2); }
.install-banner-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ─── Page Intro ─── */
.page-intro {
  padding: 20px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
}
.page-title {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -.02em;
  background: linear-gradient(135deg, #fff 40%, var(--accent-l));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-subtitle {
  font-size: .85rem;
  color: var(--text-3);
}
.btn-clear {
  margin-top: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .78rem;
  font-weight: 600;
  background: rgba(239,68,68,.15);
  color: #F87171;
  border: 1px solid rgba(239,68,68,.3);
  align-self: flex-start;
  transition: background var(--trans);
}
.btn-clear:hover { background: rgba(239,68,68,.25); }

/* ─── Tabs ─── */
.tabs {
  display: flex;
  gap: 8px;
  padding: 0 16px 12px;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 22px;
  font-size: .85rem;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-3);
  border: 1px solid var(--border);
  white-space: nowrap;
  transition: all var(--trans);
  flex-shrink: 0;
}
.tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary-l);
  box-shadow: 0 4px 16px rgba(109,40,217,.4);
}
.tab:hover:not(.active) { background: var(--surface2); color: var(--text); }

/* ─── List Cards ─── */
.list-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 16px;
}

.list-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-l);
  cursor: pointer;
  transition: background var(--trans), transform var(--trans), border-color var(--trans);
  text-decoration: none;
  color: var(--text);
  position: relative;
}
.list-card:hover {
  background: var(--surface2);
  border-color: var(--border);
  transform: translateY(-1px);
}
.list-card:active { transform: scale(.99); }

.lc-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-l));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.lc-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.lc-title {
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lc-desc {
  font-size: .78rem;
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lc-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.lc-fav-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  background: transparent;
  border: none;
  opacity: .5;
  transition: opacity var(--trans), transform var(--trans);
  cursor: pointer;
}
.lc-fav-btn:hover { opacity: 1; transform: scale(1.15); }
.lc-fav-btn.active { opacity: 1; }

.lc-arrow {
  color: var(--text-3);
  font-size: 1.2rem;
  line-height: 1;
}

/* Quick links special */
.lc-social .lc-icon { border-radius: 14px; }
.lc-social-icon-inner { font-size: 22px; }

/* Disabled card (TODO) */
.list-card.disabled {
  opacity: .5;
  cursor: default;
}
.list-card.disabled:hover { background: var(--surface); transform: none; border-color: var(--border-l); }
.disabled-badge {
  font-size: .68rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(245,158,11,.2);
  color: #FCD34D;
  border: 1px solid rgba(245,158,11,.3);
  white-space: nowrap;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  text-align: center;
  gap: 12px;
}
.empty-state-icon { font-size: 48px; opacity: .5; }
.empty-state-title { font-size: 1rem; font-weight: 600; color: var(--text-2); }
.empty-state-desc { font-size: .85rem; color: var(--text-3); }

/* ─── Buttons ─── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: 24px;
  font-size: .88rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-l), var(--primary));
  color: #fff;
  border: none;
  box-shadow: 0 4px 16px rgba(109,40,217,.4);
  transition: box-shadow var(--trans), transform var(--trans), opacity var(--trans);
  cursor: pointer;
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(109,40,217,.55); transform: translateY(-1px); }
.btn-primary:active { transform: scale(.97); }
.btn-primary.full-btn { width: 100%; margin-top: 12px; padding: 13px 22px; font-size: .92rem; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 24px;
  font-size: .85rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
  transition: background var(--trans), color var(--trans);
  cursor: pointer;
}
.btn-ghost:hover { background: var(--surface); color: var(--text); }

/* ─── Settings ─── */
.settings-block {
  margin: 0 16px 16px;
  padding: 18px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border-l);
}
.settings-label {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-3);
  margin-bottom: 14px;
}

.lang-switcher {
  display: flex;
  gap: 10px;
}
.lang-opt {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text-3);
  transition: all var(--trans);
}
.lang-opt.active {
  background: linear-gradient(135deg, var(--primary-l), var(--primary));
  color: #fff;
  border-color: var(--primary-l);
  box-shadow: var(--shadow-sm);
}
.lang-opt:hover:not(.active) { background: var(--surface2); color: var(--text); }

/* Install guide */
.install-guide { display: flex; flex-direction: column; gap: 14px; }
.guide-step { display: flex; gap: 12px; align-items: flex-start; }
.guide-step-icon { font-size: 24px; flex-shrink: 0; margin-top: 2px; }
.guide-step-body { flex: 1; }
.guide-step-body b { display: block; font-size: .9rem; color: var(--text); margin-bottom: 4px; }
.guide-step-body p { font-size: .8rem; color: var(--text-3); line-height: 1.5; }

/* About card */
.about-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 8px 0 4px;
  gap: 6px;
}
.about-logo { font-size: 40px; filter: drop-shadow(0 0 12px rgba(109,40,217,.8)); }
.about-name { font-size: 1rem; font-weight: 700; color: var(--text); }
.about-sub { font-size: .8rem; color: var(--text-3); }
.about-version { font-size: .75rem; color: var(--text-3); background: var(--bg2); padding: 2px 10px; border-radius: 10px; border: 1px solid var(--border); }
.about-links { display: flex; gap: 8px; align-items: center; font-size: .82rem; }
.about-links a { color: var(--accent); }

/* ─── Bottom Navigation ─── */
#bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 600px;
  height: calc(var(--nav-h) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  z-index: 100;
  display: flex;
  align-items: flex-start;
  background: rgba(15,8,38,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-l);
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 4px;
  height: var(--nav-h);
  color: var(--text-3);
  transition: color var(--trans);
  position: relative;
}
.nav-item::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-ll);
  border-radius: 0 0 3px 3px;
  transition: width var(--trans);
}
.nav-item.active { color: var(--accent-l); }
.nav-item.active::after { width: 28px; }
.nav-item:active { opacity: .7; }

.nav-icon {
  width: 24px;
  height: 24px;
  transition: transform var(--trans);
}
.nav-item.active .nav-icon { transform: translateY(-1px); }

.nav-label {
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .02em;
}

/* ─── Utility ─── */
.hidden { display: none !important; }

/* ─── External badge ─── */
.ext-badge {
  display: inline-flex;
  align-items: center;
  font-size: .62rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 6px;
  background: rgba(245,158,11,.2);
  color: #FCD34D;
  border: 1px solid rgba(245,158,11,.35);
  margin-inline-start: 6px;
  vertical-align: middle;
  white-space: nowrap;
  letter-spacing: .03em;
}

/* ─── Encyclopedia tools header ─── */
.enc-tools-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 20px 16px 10px;
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-3);
}
.enc-tools-icon { font-size: 1rem; }
@media (min-width: 480px) {
  .enc-tools-header { margin-inline: 20px; }
}

/* ─── Scrollbar (desktop) ─── */
#main-content::-webkit-scrollbar { width: 4px; }
#main-content::-webkit-scrollbar-track { background: transparent; }
#main-content::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
#main-content { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }

/* ─── RTL / LTR adjustments ─── */
[dir="ltr"] .hero { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; }

/* ─── Responsive: tablet / desktop ─── */
@media (min-width: 480px) {
  .hero h1 { font-size: 1.7rem; }
  .cards-grid { gap: 14px; padding: 0 20px; }
  .card { padding: 18px 22px; }
  .card-icon-box { width: 52px; height: 52px; }
  .list-cards { padding: 0 20px; }
  .settings-block { margin-inline: 20px; }
  .page-intro { padding-inline: 20px; }
  .tabs { padding-inline: 20px; }
}

@media (min-width: 600px) {
  body { background: #080515; }
  #app { box-shadow: 0 0 60px rgba(109,40,217,.2); }
  .hero-icon-wrap { width: 96px; height: 96px; }
  .hero-app-icon { width: 96px; height: 96px; }
}

/* ─── In-App Browser ─── */
.inapp-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  transform: translateY(100%);
  transition: transform .32s cubic-bezier(.4,0,.2,1);
  will-change: transform;
}
.inapp-overlay.hidden { display: none; }
.inapp-overlay.open { transform: translateY(0); }

.inapp-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  padding-top: env(safe-area-inset-top, 12px);
  height: calc(56px + env(safe-area-inset-top, 0px));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.inapp-close, .inapp-ext-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: none;
  background: transparent;
  color: var(--text-1);
  cursor: pointer;
  flex-shrink: 0;
  text-decoration: none;
  transition: background .15s;
}
.inapp-close:active, .inapp-ext-btn:active { background: var(--border); }
.inapp-title {
  flex: 1;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-1);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}
#inapp-frame {
  flex: 1;
  width: 100%;
  border: none;
  background: #fff;
}
.inapp-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  inset: 56px 0 0;
  z-index: 1;
  background: var(--bg);
  pointer-events: none;
}
.inapp-loader.hidden { display: none; }
.inapp-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.inapp-error {
  position: absolute;
  inset: 56px 0 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 32px 24px;
  background: var(--bg);
  text-align: center;
  z-index: 2;
}
.inapp-error.hidden { display: none; }
.inapp-error-icon { font-size: 3rem; }
.inapp-error-msg {
  font-size: .95rem;
  color: var(--text-2);
  max-width: 280px;
  line-height: 1.5;
}
.inapp-error-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: .95rem;
  text-decoration: none;
  margin-top: 8px;
  transition: opacity .15s;
}
.inapp-error-btn:active { opacity: .8; }

/* ─── Install Guide Sheet ─── */
.ig-backdrop {
  position: fixed;
  inset: 0;
  z-index: 400;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.ig-backdrop.hidden { display: none !important; }

.ig-sheet {
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border-radius: 28px 28px 0 0;
  padding: 12px 24px 32px;
  padding-bottom: calc(32px + env(safe-area-inset-bottom, 0px));
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  animation: slideUp .32s cubic-bezier(.4,0,.2,1);
}
@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.ig-handle {
  width: 40px; height: 4px;
  background: var(--border);
  border-radius: 4px;
  margin-bottom: 20px;
}
.ig-icon {
  width: 72px; height: 72px;
  border-radius: 18px;
  box-shadow: 0 6px 24px rgba(109,40,217,.4);
  margin-bottom: 16px;
}
.ig-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-1);
  margin: 0 0 8px;
}
.ig-sub {
  font-size: .88rem;
  color: var(--text-2);
  margin: 0 0 24px;
  line-height: 1.5;
}

/* Android install button */
.ig-install-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 15px;
  border-radius: 14px;
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(109,40,217,.4);
  transition: opacity .15s;
}
.ig-install-btn:active { opacity: .85; }

/* iOS steps */
.ig-steps {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ig-step {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg);
  border-radius: 12px;
  padding: 12px 16px;
  text-align: start;
}
.ig-step-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  color: #fff;
  font-size: .95rem;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.ig-step-text {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .9rem;
  color: var(--text-1);
  font-weight: 500;
}
.ig-step-icon { color: var(--primary); }

/* Generic message */
.ig-generic-msg {
  font-size: .9rem;
  color: var(--text-2);
  background: var(--bg);
  border-radius: 12px;
  padding: 14px 18px;
  line-height: 1.6;
  margin-bottom: 8px;
}

/* Skip button */
.ig-skip {
  margin-top: 18px;
  background: none;
  border: none;
  color: var(--text-3);
  font-size: .9rem;
  cursor: pointer;
  padding: 8px 24px;
}

/* ─── Reduced motion ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}