/* =========================================================
   KetabGard — Layout: header, nav, hero, sections, grids
   ========================================================= */

/* ---------- App header ---------- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.app-header-inner {
  display: flex;
  align-items: center;
  gap: var(--gap);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--primary-strong);
  text-decoration: none;
  letter-spacing: -0.2px;
}
.brand-mark {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary-soft), var(--teal-soft));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: .95rem;
  box-shadow: var(--shadow-sm);
}
.header-search {
  flex: 1 1 auto;
  position: relative;
  max-width: 420px;
}
.header-search input {
  width: 100%;
  padding: 9px 14px 9px 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text);
}
.header-search .search-icon {
  position: absolute;
  inset-inline-end: 11px; /* RTL: icon near start of text */
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-muted);
}
.header-actions { display: flex; align-items: center; gap: var(--gap-sm); }

.header-avatar-link { text-decoration: none; }
.header-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 2px solid var(--surface);
  box-shadow: var(--shadow-sm);
}

/* ---------- Top navigation (desktop) ---------- */
.top-nav {
  display: flex;
  gap: 6px;
  background: transparent;
}
.top-nav .nav-link {
  position: relative;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}
.top-nav .nav-link:hover { background: var(--surface-2); color: var(--text); }
.top-nav .nav-link.is-active {
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-weight: 800;
}
.top-nav .nav-link.is-active::after {
  content: "";
  position: absolute;
  inset-inline: 20%;
  bottom: 2px;
  height: 3px;
  border-radius: 2px;
  background: var(--primary);
}

/* ---------- Bottom navigation (mobile) ---------- */
.bottom-nav {
  position: fixed;
  bottom: 0;
  inset-inline: 0;
  z-index: 60;
  height: var(--bottom-nav-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  box-shadow: 0 -2px 10px rgba(60,55,52,.08);
  display: flex;
  align-items: center;
  justify-content: space-around;
  transition: transform var(--transition);
}
.bottom-nav.is-hidden { transform: translateY(100%); }
.bottom-nav .nav-link {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 7px 0;
  color: var(--text-muted);
  text-decoration: none;
  font-size: var(--fs-xs);
  transition: color var(--transition);
}
.bottom-nav .nav-link .nav-icon { font-size: 1.25rem; line-height: 1; }
.bottom-nav .nav-link.is-active { color: var(--primary-strong); font-weight: 700; }

/* ---------- Page scaffold ---------- */
.page {
  min-height: calc(100vh - var(--header-h) - var(--bottom-nav-h));
  padding-block-end: calc(var(--bottom-nav-h) + 28px); /* room for bottom nav */
}
.page-main > .container { padding-block-start: 18px; }

/* ---------- Page hero (home) ---------- */
.hero {
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  color: var(--text);
  background: linear-gradient(120deg, #EFF3EA 0%, #EAF2F1 55%, #F5ECE2 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.hero-heading {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--primary-strong);
  margin: 0;
  line-height: 1.4;
}
.hero-text { font-size: 1.05rem; color: var(--text-2); margin-block: 8px 18px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-figure {
  position: absolute;
  inset-block-start: 0;
  inset-inline-end: 24px;
  width: 150px;
  height: 150px;
  opacity: .9;
  filter: drop-shadow(0 8px 18px rgba(60,55,52,.18));
  pointer-events: none;
}

/* ---------- Section ---------- */
.section { margin-block: var(--section-gap); }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--gap-sm);
  margin-block-end: 18px;
}
.section-title { font-size: 1.25rem; font-weight: 800; color: var(--text); margin: 0; }
.section-subtitle { color: var(--text-muted); font-size: var(--fs-sm); margin: 0; }
.section-more { font-size: var(--fs-sm); font-weight: 600; color: var(--primary); text-decoration: none; }

/* ---------- Horizontal book row ---------- */
.book-row {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-block-end: 8px;
  -webkit-overflow-scrolling: touch;
}
.book-row > * { scroll-snap-align: start; flex: 0 0 auto; }
.book-row::-webkit-scrollbar { height: 8px; }
.book-row::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 8px; }

/* ---------- Book grid (browse) ---------- */
.book-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}

/* ---------- Page intro banner ---------- */
.page-head { margin-block-end: 6px; }
.page-title { font-size: 1.5rem; font-weight: 800; margin: 0; }
.page-subtitle { color: var(--text-muted); margin: 2px 0 0; }

/* ---------- Two-column detail layout ---------- */
.detail-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 34px;
  align-items: start;
}
@media (max-width: 900px) {
  .detail-layout { grid-template-columns: 1fr; }
}

/* ---------- Filters toolbar (books) ---------- */
.filter-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 30;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  margin-block-end: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-search {
  margin-inline-start: auto;
  min-width: 150px;
}
.filter-search input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text);
}
.filter-empty { padding: 40px; text-align: center; color: var(--text-muted); }

/* ---------- Settings page layout ---------- */
.settings-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 820px) {
  .settings-layout { grid-template-columns: 1fr; }
  .settings-side { display: none; }
}
.settings-side {
  position: sticky;
  top: calc(var(--header-h) + 12px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.settings-side .side-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 13px;
  border-radius: 10px;
  color: var(--text-2);
  text-decoration: none;
  font-weight: 600;
}
.settings-side .side-link.is-active { background: var(--primary-soft); color: var(--primary-strong); font-weight: 800; }

/* =========================================================
   Phase 3.5 — Liquid Glass layout layer (overrides above)
   ========================================================= */
.app-header {
  height: var(--kg-header-h);
  background: var(--kg-glass-bg);
  -webkit-backdrop-filter: var(--kg-glass-blur);
  backdrop-filter: var(--kg-glass-blur);
  border-bottom: 1px solid var(--kg-glass-border);
  box-shadow: 0 6px 24px -18px rgba(80, 55, 35, .4);
}
.app-header-inner { gap: 18px; }

.brand { color: var(--kg-primary-deep); }
.brand-mark {
  width: 38px; height: 38px; border-radius: 13px;
  background: linear-gradient(140deg, var(--kg-primary) 0%, var(--kg-sand) 100%);
  color: #fff; box-shadow: 0 6px 16px -6px rgba(135, 85, 63, .6);
}

.header-search input {
  background: var(--kg-glass-strong);
  border: 1px solid var(--kg-glass-border);
  border-radius: var(--kg-r-pill);
  box-shadow: inset 0 1px 2px rgba(80, 55, 35, .05);
  padding: 10px 16px 10px 40px;
  transition: box-shadow var(--kg-transition), border-color var(--kg-transition);
}
.header-search input:focus { outline: none; border-color: var(--kg-primary-soft); box-shadow: 0 0 0 3px rgba(164,119,100,.18); }

.top-nav .nav-link { font-weight: 700; color: var(--kg-ink-2); }
.top-nav .nav-link:hover { background: rgba(255, 250, 244, .7); color: var(--kg-ink); }
.top-nav .nav-link.is-active {
  background: var(--kg-glass-strong);
  color: var(--kg-primary-deep);
  font-weight: 800;
  box-shadow: 0 4px 14px -8px rgba(135, 85, 63, .55), inset 0 0 0 1px var(--kg-glass-border);
}
.top-nav .nav-link.is-active::after { display: none; }

.bottom-nav {
  height: var(--kg-bottom-nav-h);
  background: var(--kg-glass-strong);
  -webkit-backdrop-filter: var(--kg-glass-blur);
  backdrop-filter: var(--kg-glass-blur);
  border-top: 1px solid var(--kg-glass-border);
  box-shadow: 0 -8px 30px -18px rgba(80, 55, 35, .5);
}
.bottom-nav .nav-link.is-active { color: var(--kg-primary-deep); }
.bottom-nav .nav-link.is-active .nav-icon { filter: drop-shadow(0 2px 6px var(--kg-icon-glow)); }

.hero {
  background:
    radial-gradient(420px 260px at 90% 0%, var(--kg-bg-glow-1), transparent 60%),
    radial-gradient(360px 240px at 4% 100%, var(--kg-bg-glow-3), transparent 55%),
    linear-gradient(140deg, var(--kg-cream) 0%, var(--kg-bg) 55%, var(--kg-beige) 100%);
  border: 1px solid var(--kg-glass-border);
  border-radius: var(--kg-r-lg) var(--kg-r-lg) var(--kg-r-lg) var(--kg-r-xl);
  box-shadow: var(--kg-sh);
  padding: 44px 40px;
}
.hero-heading { color: var(--kg-primary-deep); }
.hero-figure { filter: drop-shadow(0 10px 22px rgba(110,66,48,.28)); }

.section { margin-block: var(--kg-section-gap); }
.section-title { font-weight: 800; color: var(--kg-ink); }
.section-more { font-weight: 800; color: var(--kg-primary-strong); }
.section-more:hover { color: var(--kg-primary-deep); }

.book-row { gap: 18px; padding-block-end: 12px; }
.book-row::-webkit-scrollbar { height: 8px; }
.book-row::-webkit-scrollbar-thumb { background: var(--kg-sand); border-radius: 999px; border: 2px solid transparent; background-clip: padding-box; }

.page-title { color: var(--kg-ink); }
.page-subtitle { color: var(--kg-ink-3); }

.filter-bar {
  background: var(--kg-glass-bg);
  -webkit-backdrop-filter: var(--kg-glass-blur);
  backdrop-filter: var(--kg-glass-blur);
  border: 1px solid var(--kg-glass-border);
  border-radius: var(--kg-r-md);
  box-shadow: var(--kg-sh-sm);
  padding: 12px 16px;
}
.filter-search input {
  background: var(--kg-glass-strong);
  border: 1px solid var(--kg-glass-border);
  border-radius: var(--kg-r-pill);
  box-shadow: inset 0 1px 2px rgba(80, 55, 35, .05);
}
.filter-search input:focus { outline: none; border-color: var(--kg-primary-soft); box-shadow: 0 0 0 3px rgba(164,119,100,.18); }

.settings-side {
  background: var(--kg-glass-bg);
  -webkit-backdrop-filter: var(--kg-glass-blur);
  backdrop-filter: var(--kg-glass-blur);
  border: 1px solid var(--kg-glass-border);
  border-radius: var(--kg-r-md);
  box-shadow: var(--kg-sh-sm);
}
.settings-side .side-link { font-weight: 700; color: var(--kg-ink-2); border-radius: var(--kg-r-sm); }
.settings-side .side-link.is-active { background: var(--kg-primary-soft); color: var(--kg-primary-deep); font-weight: 800; }