/* =============================================
   E-Book Platform – Modern Professional Theme
   ============================================= */

/* Google Fonts: Inter is loaded via _Layout.cshtml */
:root {
  --navy:       #0f3460;
  --navy-dark:  #0a2442;
  --accent:     #e94560;
  --accent2:    #533483;
  --bg:         #f4f6fb;
  --surface:    #ffffff;
  --text:       #1e2a3a;
  --text-muted: #6b7a90;
  --border:     #e2e8f0;
  --shadow-sm:  0 2px 8px rgba(15,52,96,.08);
  --shadow-md:  0 6px 24px rgba(15,52,96,.14);
  --shadow-lg:  0 12px 40px rgba(15,52,96,.20);
  --radius:     10px;
  --transition: .22s ease;
}

/* ---- Reset / Base ---- */
html { font-size: 15px; position: relative; min-height: 100%; }

@media (min-width: 768px) { html { font-size: 16px; } }

body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin-bottom: 70px;
}

/* ---- Navbar ---- */
.navbar {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%) !important;
  border-bottom: none !important;
  box-shadow: 0 2px 16px rgba(10,36,66,.35) !important;
  padding: .65rem 1.25rem;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -.3px;
  display: flex;
  align-items: center;
  gap: .55rem;
  color: #fff !important;
}

.navbar-brand .brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  border-radius: 8px;
  font-size: .85rem;
  color: #fff;
  flex-shrink: 0;
}

.navbar-brand span { color: #fff; }

.nav-link {
  color: rgba(255,255,255,.80) !important;
  font-size: .875rem;
  font-weight: 500;
  padding: .42rem .75rem !important;
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-link:hover,
.nav-link:focus {
  color: #fff !important;
  background: rgba(255,255,255,.12);
}
.nav-link.active {
  color: #fff !important;
  background: rgba(255,255,255,.18);
}

/* dropdown */
.dropdown-menu {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: .4rem;
  min-width: 180px;
}
.dropdown-item {
  border-radius: 6px;
  font-size: .875rem;
  padding: .45rem .85rem;
  color: var(--text);
  transition: background var(--transition);
}
.dropdown-item:hover { background: var(--bg); color: var(--navy); }

/* ---- Alerts ---- */
.alert {
  border: none;
  border-radius: var(--radius);
  font-size: .9rem;
  box-shadow: var(--shadow-sm);
}

/* ---- Cards ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.card-header {
  background: transparent;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 1rem;
}

/* ---- Buttons ---- */
.btn {
  font-weight: 500;
  border-radius: 8px;
  transition: all var(--transition);
  font-size: .875rem;
}
.btn:focus, .btn:active:focus,
.form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 3px rgba(15,52,96,.2);
}

.btn-primary {
  background: linear-gradient(135deg, var(--navy), var(--accent2));
  border: none;
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--navy-dark), var(--accent2));
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-success {
  background: linear-gradient(135deg, #1b7a4e, #26a869);
  border: none;
}
.btn-success:hover {
  background: linear-gradient(135deg, #155f3e, #1e9458);
  transform: translateY(-1px);
}

.btn-danger {
  background: linear-gradient(135deg, #b91c1c, var(--accent));
  border: none;
}
.btn-danger:hover {
  background: linear-gradient(135deg, #991b1b, #c73652);
  transform: translateY(-1px);
}

.btn-outline-primary {
  border-color: var(--navy);
  color: var(--navy);
}
.btn-outline-primary:hover {
  background: var(--navy);
  border-color: var(--navy);
}

.btn-outline-secondary {
  border-color: var(--border);
  color: var(--text-muted);
}
.btn-outline-secondary:hover {
  background: var(--bg);
  color: var(--text);
  border-color: #c5cdd8;
}

/* ---- Forms ---- */
.form-control, .form-select {
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: .9rem;
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition);
  padding: .5rem .85rem;
}
.form-control:focus, .form-select:focus {
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(15,52,96,.12);
}
.form-label {
  font-weight: 500;
  font-size: .875rem;
  color: var(--text);
  margin-bottom: .35rem;
}

/* ---- Tables ---- */
.table {
  font-size: .875rem;
  color: var(--text);
}
.table thead th {
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  font-size: .8rem;
  letter-spacing: .4px;
  text-transform: uppercase;
  border: none;
  padding: .75rem 1rem;
}
.table thead th:first-child { border-radius: 8px 0 0 0; }
.table thead th:last-child  { border-radius: 0 8px 0 0; }
.table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.table tbody tr:hover { background: rgba(15,52,96,.04); }
.table tbody td { padding: .7rem 1rem; vertical-align: middle; }
.table-striped > tbody > tr:nth-of-type(odd) > * { background: rgba(244,246,251,.6); }

/* ---- Page titles ---- */
.page-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -.4px;
}
.page-subtitle {
  color: var(--text-muted);
  font-size: .92rem;
}

/* ---- Hero (homepage) ---- */
.hero-section {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 55%, var(--accent2) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 3rem 2.5rem 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}
.hero-section::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 280px; height: 280px;
  background: rgba(255,255,255,.05);
  border-radius: 50%;
}
.hero-section::after {
  content: '';
  position: absolute;
  bottom: -80px; left: 30%;
  width: 200px; height: 200px;
  background: rgba(255,255,255,.04);
  border-radius: 50%;
}
.hero-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -.5px;
  margin-bottom: .5rem;
}
.hero-lead {
  font-size: 1rem;
  opacity: .80;
  margin-bottom: 1.75rem;
}
.hero-btn {
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  font-weight: 600;
  padding: .65rem 1.6rem;
  border-radius: 50px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  transition: background var(--transition), transform var(--transition);
  font-size: .9rem;
}
.hero-btn:hover {
  background: rgba(255,255,255,.28);
  color: #fff;
  transform: translateY(-2px);
}
.hero-btn-solid {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-color: transparent;
}
.hero-btn-solid:hover {
  background: linear-gradient(135deg, #c73652, var(--accent2));
}

.stat-card {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  text-align: center;
  backdrop-filter: blur(4px);
}
.stat-card .stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: .15rem;
}
.stat-card .stat-label {
  font-size: .78rem;
  opacity: .75;
  text-transform: uppercase;
  letter-spacing: .5px;
}

/* ---- Search bar ---- */
.search-bar-wrapper {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border);
  margin-bottom: 1.75rem;
}

/* ---- Book cards ---- */
.book-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.book-card-cover {
  background: linear-gradient(135deg, var(--navy) 0%, var(--accent2) 100%);
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: rgba(255,255,255,.55);
}
.book-card-body {
  padding: 1rem 1.1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.book-card-title {
  font-weight: 700;
  font-size: .95rem;
  color: var(--navy);
  margin-bottom: .3rem;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.book-card-author {
  font-size: .8rem;
  color: var(--text-muted);
  margin-bottom: .6rem;
}
.book-card-meta {
  font-size: .78rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: .6rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
}

/* ---- Empty state ---- */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}
.empty-state-icon {
  width: 80px; height: 80px;
  background: linear-gradient(135deg, var(--navy), var(--accent2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 1.8rem;
  color: rgba(255,255,255,.6);
}
.empty-state h5 {
  font-weight: 700;
  color: var(--text);
  margin-bottom: .4rem;
}
.empty-state p { font-size: .9rem; margin-bottom: 1.25rem; }

/* ---- Badge ---- */
.badge {
  font-weight: 500;
  border-radius: 50px;
  padding: .3em .75em;
  font-size: .74rem;
}

/* ---- Footer ---- */
.footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,.55);
  font-size: .82rem;
  padding: 1rem 0;
  position: absolute;
  bottom: 0;
  width: 100%;
}
.footer a { color: rgba(255,255,255,.7); }
.footer a:hover { color: #fff; }

/* ---- Pagination ---- */
.page-link {
  border-radius: 6px !important;
  margin: 0 2px;
  border: 1px solid var(--border);
  color: var(--navy);
  font-size: .85rem;
  transition: all var(--transition);
}
.page-link:hover { background: var(--navy); color: #fff; border-color: var(--navy); }
.page-item.active .page-link { background: var(--navy); border-color: var(--navy); }

/* ---- Misc utilities ---- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
.section-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  margin: 0;
}
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* ---- Scroll fade in ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .45s ease both; }

/* =============================================
   Landing Page
   ============================================= */

/* --- Hero --- */
.lp-hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 55%, var(--accent2) 100%);
  border-radius: 16px;
  padding: 3.5rem 2.75rem 3rem;
  margin-bottom: 2.5rem;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.lp-hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
}
.lp-hero-glow-1 {
  width: 320px; height: 320px;
  background: rgba(233,69,96,.25);
  top: -80px; right: -60px;
}
.lp-hero-glow-2 {
  width: 240px; height: 240px;
  background: rgba(83,52,131,.30);
  bottom: -80px; left: 20%;
}
.lp-badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.25);
  color: rgba(255,255,255,.9);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
  padding: .3rem .9rem;
  border-radius: 50px;
}
.lp-hero-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.5px;
  margin-bottom: .75rem;
}
.lp-gradient-text {
  background: linear-gradient(90deg, #f472b6, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.lp-hero-lead {
  font-size: 1.05rem;
  opacity: .8;
  max-width: 460px;
  line-height: 1.6;
}

/* --- Hero buttons --- */
.lp-btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 1.75rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: .9rem;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}
.lp-btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
}
.lp-btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(233,69,96,.45);
}
.lp-btn-ghost {
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.3);
  color: #fff;
}
.lp-btn-ghost:hover {
  background: rgba(255,255,255,.24);
  color: #fff;
  transform: translateY(-2px);
}

/* --- Hero feature cards --- */
.lp-hero-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.lp-hcard {
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  display: flex;
  align-items: center;
  gap: .85rem;
  backdrop-filter: blur(6px);
  transition: background var(--transition), transform var(--transition);
}
.lp-hcard:hover {
  background: rgba(255,255,255,.16);
  transform: translateY(-3px);
}
.lp-hcard i { opacity: .85; flex-shrink: 0; }
.lp-hcard-label { font-weight: 700; font-size: .92rem; }
.lp-hcard-sub   { font-size: .75rem; opacity: .65; margin-top: .1rem; }

/* card accent colours */
.lp-hcard-1 { border-top: 2px solid rgba(99,179,237,.4); }
.lp-hcard-2 { border-top: 2px solid rgba(72,187,120,.4); }
.lp-hcard-3 { border-top: 2px solid rgba(236,153,75,.4); }
.lp-hcard-4 { border-top: 2px solid rgba(233,69,96,.4); }

/* --- Section header --- */
.lp-section { margin-bottom: 2.5rem; }
.lp-section-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .35rem;
}
.lp-section-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -.3px;
  margin: 0;
}

/* --- Feature cards --- */
.lp-feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.6rem 1.5rem;
  height: 100%;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.lp-feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.lp-feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}
.lp-feature-card h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .5rem;
}
.lp-feature-card p {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.55;
  flex: 1;
  margin-bottom: 1rem;
}
.lp-feature-link {
  font-size: .82rem;
  font-weight: 600;
  color: var(--navy);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  transition: gap var(--transition), color var(--transition);
}
.lp-feature-link:hover { color: var(--accent); gap: .55rem; }

/* --- Quick tiles --- */
.lp-quick-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem .75rem;
  text-decoration: none;
  color: var(--navy);
  font-weight: 600;
  font-size: .82rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.lp-quick-tile i {
  font-size: 1.4rem;
  color: var(--navy);
  opacity: .75;
  transition: opacity var(--transition);
}
.lp-quick-tile:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  color: #fff;
  border-color: transparent;
}
.lp-quick-tile:hover i { opacity: 1; color: #fff; }

/* --- CTA banner --- */
.lp-cta {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 60%, var(--accent2) 100%);
  border-radius: 16px;
  padding: 2.5rem 2.75rem;
  color: #fff;
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
}
.lp-cta-glow {
  position: absolute;
  width: 300px; height: 300px;
  background: rgba(233,69,96,.2);
  border-radius: 50%;
  filter: blur(60px);
  right: -60px; top: -60px;
  pointer-events: none;
}
.lp-cta-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -.3px;
  margin-bottom: .4rem;
}
.lp-cta-sub { font-size: .95rem; opacity: .75; margin: 0; }