/* ==========================================================================
   SahaayaNet - Sahaaya Library Product Page Stylesheet (library.css)
   Official styles for Sahaaya Library - Your Digital Academic Library.
   Palette: Academic Royal Blue (#2563EB), Indigo (#4F46E5), Sky (#0EA5E9),
   Emerald (#10B981), Amber (#F59E0B)
   ========================================================================== */

:root {
  --lib-primary: #4F46E5;
  --lib-primary-hover: #4338CA;
  --lib-primary-light: rgba(79, 70, 229, 0.09);
  --lib-primary-glow: rgba(79, 70, 229, 0.28);

  --lib-cyan: #0EA5E9;
  --lib-cyan-light: rgba(14, 165, 233, 0.1);

  --lib-emerald: #10B981;
  --lib-emerald-light: rgba(16, 185, 129, 0.1);

  --lib-amber: #F59E0B;
  --lib-amber-light: rgba(245, 158, 11, 0.12);

  --lib-border: rgba(226, 232, 240, 0.85);
  --lib-card-bg: #FFFFFF;
  --lib-surface-alt: #F1F5F9;
}

[data-theme="dark"] {
  --lib-primary-light: rgba(99, 102, 241, 0.16);
  --lib-primary-glow: rgba(99, 102, 241, 0.35);
  --lib-border: rgba(255, 255, 255, 0.1);
  --lib-card-bg: #111827;
  --lib-surface-alt: #1E293B;
}

/* ==========================================================================
   Breadcrumb Navigation
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb-separator {
  color: var(--text-light);
  font-size: 0.75rem;
}

.breadcrumb-current {
  color: var(--lib-primary);
  font-weight: 700;
}

[data-theme="dark"] .breadcrumb-current {
  color: #818CF8;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.lib-hero-section {
  position: relative;
  padding-top: 7rem;
  padding-bottom: 5rem;
  overflow: hidden;
}

.lib-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: center;
}

@media (min-width: 992px) {
  .lib-hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

.lib-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  background: var(--lib-primary-light);
  color: var(--lib-primary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border: 1px solid rgba(79, 70, 229, 0.22);
  margin-bottom: 1.25rem;
}

[data-theme="dark"] .lib-hero-badge {
  color: #A5B4FC;
  background: rgba(99, 102, 241, 0.18);
  border-color: rgba(165, 180, 252, 0.25);
}

.lib-hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.lib-hero-headline {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #4F46E5 0%, #0EA5E9 50%, #10B981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="dark"] .lib-hero-headline {
  background: linear-gradient(135deg, #818CF8 0%, #38BDF8 50%, #34D399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lib-hero-desc {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 1.75rem;
}

.product-meta-badges {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.25rem;
}

.meta-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-pill);
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: var(--shadow-soft);
  transition: var(--transition-fast);
}

.meta-badge-item:hover {
  transform: translateY(-2px);
  border-color: var(--lib-primary);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Hero Visual Stage & Phone Mockup
   ========================================================================== */
.lib-hero-stage {
  position: relative;
  width: 100%;
  max-width: 500px;
  min-height: 540px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.lib-glow-backdrop {
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.24) 0%, rgba(14, 165, 233, 0.16) 45%, transparent 72%);
  filter: blur(48px);
  animation: libGlowPulse 8s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes libGlowPulse {
  0% { transform: scale(0.95) translate(0, 0); opacity: 0.8; }
  100% { transform: scale(1.08) translate(10px, -10px); opacity: 1; }
}

/* Floating Glass Badges */
.lib-floating-badge {
  position: absolute;
  z-index: 5;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-pill);
  padding: 0.55rem 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: #0F172A;
  box-shadow: 0 10px 25px -4px rgba(15, 23, 42, 0.12);
  display: flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  animation: libFloat 6s ease-in-out infinite alternate;
}

[data-theme="dark"] .lib-floating-badge {
  background: rgba(17, 24, 39, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: rgba(255, 255, 255, 0.14);
  color: #F8FAFC;
  box-shadow: 0 14px 28px -4px rgba(0, 0, 0, 0.55);
}

.lib-badge-top-left {
  top: 35px;
  left: -20px;
  animation-delay: 0s;
}

.lib-badge-top-right {
  top: 90px;
  right: -30px;
  animation-delay: 1.5s;
}

.lib-badge-bottom-left {
  bottom: 80px;
  left: -25px;
  animation-delay: 3s;
}

.lib-badge-bottom-right {
  bottom: 30px;
  right: -15px;
  animation-delay: 4.5s;
}

@keyframes libFloat {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-10px); }
}

/* Phone Frame */
.lib-phone-frame {
  position: relative;
  z-index: 2;
  width: 295px;
  height: 560px;
  background: #020617;
  border-radius: 40px;
  border: 7px solid #1E293B;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

[data-theme="dark"] .lib-phone-frame {
  border-color: #334155;
  box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.12);
}

/* Notch & Status Bar */
.lib-phone-notch {
  width: 105px;
  height: 18px;
  background: #0F172A;
  margin: 0 auto;
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.lib-camera-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #1E293B;
}

.lib-speaker-pill {
  width: 30px;
  height: 3px;
  border-radius: 2px;
  background: #1E293B;
}

.lib-phone-statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 1rem;
  font-size: 0.68rem;
  font-weight: 700;
  color: #94A3B8;
}

.lib-phone-inner {
  flex: 1;
  background: #0B0F19;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  overflow: hidden;
  color: #F8FAFC;
}

.lib-app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lib-app-brand {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.lib-app-brand-icon {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, #4F46E5, #0EA5E9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
}

.lib-app-brand-text {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.lib-app-pill-live {
  font-size: 0.62rem;
  background: rgba(16, 185, 129, 0.16);
  color: #34D399;
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  font-weight: 700;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Mock Search Field */
.lib-mock-search {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: #151D2F;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 0.45rem 0.65rem;
  font-size: 0.68rem;
  color: #94A3B8;
}

/* Category Quick Bar */
.lib-mock-cat-bar {
  display: flex;
  gap: 0.35rem;
  overflow-x: hidden;
}

.lib-mock-cat-chip {
  font-size: 0.62rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  color: #94A3B8;
  white-space: nowrap;
}

.lib-mock-cat-chip.active {
  background: #4F46E5;
  color: #FFFFFF;
}

/* Featured Textbook Card in Mockup */
.lib-mock-featured-card {
  background: linear-gradient(145deg, #151D2F 0%, #0F172A 100%);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: 14px;
  padding: 0.75rem;
  display: flex;
  gap: 0.65rem;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.3);
}

.lib-mock-book-cover {
  width: 48px;
  height: 64px;
  border-radius: 6px;
  background: linear-gradient(135deg, #4F46E5, #0EA5E9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25);
  flex-shrink: 0;
}

.lib-mock-book-details {
  flex: 1;
  min-width: 0;
}

.lib-mock-tag {
  font-size: 0.58rem;
  font-weight: 700;
  color: #38BDF8;
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}

.lib-mock-book-title {
  font-size: 0.74rem;
  font-weight: 800;
  line-height: 1.25;
  color: #FFFFFF;
  margin-bottom: 0.2rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lib-mock-book-sub {
  font-size: 0.62rem;
  color: #94A3B8;
  margin-bottom: 0.35rem;
}

.lib-mock-btn-row {
  display: flex;
  gap: 0.35rem;
}

.lib-mock-btn-sm {
  font-size: 0.6rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  border: none;
  cursor: default;
}

.lib-mock-btn-primary {
  background: #4F46E5;
  color: white;
}

.lib-mock-btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #CBD5E1;
}

/* Secondary List in Mockup */
.lib-mock-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.lib-mock-list-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 0.45rem 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lib-mock-list-title {
  font-size: 0.68rem;
  font-weight: 700;
  color: #E2E8F0;
}

.lib-mock-list-meta {
  font-size: 0.58rem;
  color: #94A3B8;
}

/* Mock Bottom Nav */
.lib-mock-bottom-nav {
  margin-top: auto;
  background: #111827;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  display: flex;
  justify-content: space-around;
  padding: 0.45rem 0;
  font-size: 0.6rem;
  color: #94A3B8;
}

.lib-mock-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  cursor: default;
}

.lib-mock-nav-item.active {
  color: #818CF8;
  font-weight: 700;
}

/* ==========================================================================
   Section Common Styling
   ========================================================================== */
.lib-section {
  padding: 5.5rem 0;
  position: relative;
}

.lib-section-alt {
  background: var(--bg-subtle);
}

[data-theme="dark"] .lib-section-alt {
  background: #0E1422;
}

.lib-section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem auto;
}

.lib-section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  background: var(--lib-primary-light);
  color: var(--lib-primary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.85rem;
  border: 1px solid rgba(79, 70, 229, 0.2);
}

[data-theme="dark"] .lib-section-badge {
  color: #A5B4FC;
  background: rgba(99, 102, 241, 0.16);
  border-color: rgba(165, 180, 252, 0.22);
}

.lib-section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
}

.lib-section-desc {
  font-size: 1.075rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   Section 2: Introduction (4 Cards)
   ========================================================================== */
.lib-intro-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.lib-intro-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 2rem 1.6rem;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.lib-intro-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #4F46E5, #0EA5E9);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lib-intro-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(79, 70, 229, 0.35);
}

.lib-intro-card:hover::after {
  opacity: 1;
}

.lib-intro-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--lib-primary-light);
  color: var(--lib-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: var(--transition-fast);
}

[data-theme="dark"] .lib-intro-icon-wrap {
  color: #818CF8;
  background: rgba(99, 102, 241, 0.18);
}

.lib-intro-card:hover .lib-intro-icon-wrap {
  background: var(--lib-primary);
  color: #FFFFFF;
}

.lib-intro-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.lib-intro-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Section 3: Resource Ecosystem (8 Categories)
   ========================================================================== */
.lib-eco-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.lib-filter-btn {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  padding: 0.5rem 1.15rem;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-fast);
}

.lib-filter-btn:hover {
  color: var(--lib-primary);
  border-color: rgba(79, 70, 229, 0.35);
}

.lib-filter-btn.active {
  background: var(--lib-primary);
  color: #FFFFFF;
  border-color: var(--lib-primary);
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.lib-eco-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.lib-eco-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.lib-eco-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(79, 70, 229, 0.4);
}

.lib-eco-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.lib-eco-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.lib-eco-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  background: var(--bg-subtle);
  color: var(--text-muted);
}

[data-theme="dark"] .lib-eco-tag {
  background: rgba(255, 255, 255, 0.08);
  color: #CBD5E1;
}

.lib-eco-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.45rem;
}

.lib-eco-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex: 1;
}

.lib-eco-action {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--lib-primary);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  transition: var(--transition-fast);
}

[data-theme="dark"] .lib-eco-action {
  color: #818CF8;
}

.lib-eco-action:hover {
  gap: 0.65rem;
  color: var(--lib-cyan);
}

/* ==========================================================================
   Section 4: Feature Highlights (8 Capabilities)
   ========================================================================== */
.lib-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.lib-feat-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.lib-feat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(14, 165, 233, 0.4);
}

.lib-feat-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--lib-cyan-light);
  color: var(--lib-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.15rem;
}

[data-theme="dark"] .lib-feat-icon {
  background: rgba(14, 165, 233, 0.18);
  color: #38BDF8;
}

.lib-feat-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.45rem;
}

.lib-feat-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Section 5: App Experience (5-Step Flow)
   ========================================================================== */
.lib-steps-wrapper {
  position: relative;
  max-width: 1060px;
  margin: 0 auto;
}

/* Horizontal connecting line on desktop */
.lib-steps-line {
  position: absolute;
  top: 36px;
  left: 5%;
  right: 5%;
  height: 2px;
  background: linear-gradient(90deg, #4F46E5, #0EA5E9, #10B981);
  z-index: 1;
  opacity: 0.35;
}

.lib-steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
  position: relative;
  z-index: 2;
}

.lib-step-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.25rem;
  text-align: center;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
}

.lib-step-card:hover, .lib-step-card.active {
  transform: translateY(-5px);
  border-color: var(--lib-primary);
  box-shadow: var(--shadow-hover);
}

.lib-step-card.active {
  border-color: var(--lib-primary);
  background: var(--card-bg);
  box-shadow: 0 12px 30px -5px rgba(79, 70, 229, 0.22);
}

.lib-step-number {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 2px solid var(--border-light);
  color: var(--lib-primary);
  font-size: 0.95rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.15rem;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-soft);
}

[data-theme="dark"] .lib-step-number {
  background: #1E293B;
  border-color: rgba(255, 255, 255, 0.15);
  color: #A5B4FC;
}

.lib-step-card:hover .lib-step-number,
.lib-step-card.active .lib-step-number {
  background: var(--lib-primary);
  border-color: var(--lib-primary);
  color: #FFFFFF;
}

.lib-step-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.45rem;
}

.lib-step-desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Step Interactive Preview Box */
.lib-step-preview-box {
  margin-top: 2.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: var(--shadow-soft);
}

.lib-step-preview-info {
  flex: 1;
}

.lib-step-preview-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--lib-primary);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

[data-theme="dark"] .lib-step-preview-tag {
  color: #818CF8;
}

.lib-step-preview-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.45rem;
}

.lib-step-preview-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.lib-step-preview-chip {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  background: var(--lib-primary-light);
  color: var(--lib-primary);
  font-weight: 700;
  font-size: 0.85rem;
  white-space: nowrap;
}

[data-theme="dark"] .lib-step-preview-chip {
  background: rgba(99, 102, 241, 0.2);
  color: #A5B4FC;
}

/* ==========================================================================
   Section 6: Mobile App Showcase (Interactive 6 Screens)
   ========================================================================== */
.lib-showcase-container {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 3rem;
  align-items: center;
}

.lib-screens-nav {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.lib-screen-tab {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 16px;
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: left;
}

.lib-screen-tab:hover {
  transform: translateX(4px);
  border-color: rgba(79, 70, 229, 0.35);
}

.lib-screen-tab.active {
  background: var(--card-bg);
  border-color: var(--lib-primary);
  box-shadow: 0 10px 24px -5px rgba(79, 70, 229, 0.18);
}

[data-theme="dark"] .lib-screen-tab.active {
  border-color: #818CF8;
  background: #151D2F;
}

.lib-tab-icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--bg-subtle);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition-fast);
}

[data-theme="dark"] .lib-tab-icon-wrap {
  background: #1E293B;
  color: #CBD5E1;
}

.lib-screen-tab.active .lib-tab-icon-wrap {
  background: var(--lib-primary);
  color: #FFFFFF;
}

.lib-tab-info {
  flex: 1;
}

.lib-tab-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.lib-tab-snippet {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* Active Screen Phone Presentation */
.lib-showcase-phone-stage {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.lib-showcase-phone {
  width: 310px;
  height: 590px;
  background: #020617;
  border-radius: 42px;
  border: 7px solid #1E293B;
  box-shadow: 0 25px 60px -10px rgba(15, 23, 42, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

[data-theme="dark"] .lib-showcase-phone {
  border-color: #334155;
  box-shadow: 0 30px 70px -15px rgba(0, 0, 0, 0.75);
}

.lib-phone-screen-body {
  flex: 1;
  background: #0B0F19;
  color: #F8FAFC;
  padding: 1rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  overflow-y: auto;
}

.lib-screen-badge-label {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 800;
  color: #38BDF8;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.lib-screen-view-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.25;
}

/* ==========================================================================
   Section 7: Student-First Design (4 Pillars)
   ========================================================================== */
.lib-pillars-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.lib-pillar-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 2.25rem 1.65rem;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.lib-pillar-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(16, 185, 129, 0.4);
}

.lib-pillar-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--lib-emerald-light);
  color: var(--lib-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

[data-theme="dark"] .lib-pillar-icon {
  background: rgba(16, 185, 129, 0.18);
  color: #34D399;
}

.lib-pillar-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.lib-pillar-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Section 8: Library Management (Subtle, Behind the Scenes)
   ========================================================================== */
.lib-mgmt-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: 28px;
  padding: 3rem;
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .lib-mgmt-card {
  background: #111827;
  border-color: rgba(255, 255, 255, 0.1);
}

.lib-mgmt-inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: center;
}

.lib-mgmt-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 1rem;
}

[data-theme="dark"] .lib-mgmt-badge {
  background: rgba(255, 255, 255, 0.08);
  color: #CBD5E1;
}

.lib-mgmt-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.lib-mgmt-text {
  font-size: 1.025rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.lib-mgmt-note {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
  border-left: 2px solid var(--lib-primary);
  padding-left: 1rem;
}

/* Management Flow Graphic (Abstract, Non-confidential) */
.lib-mgmt-flow {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}

.lib-flow-node {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  transition: var(--transition-fast);
}

[data-theme="dark"] .lib-flow-node {
  background: #151D2F;
  border-color: rgba(255, 255, 255, 0.08);
}

.lib-flow-node:hover {
  border-color: var(--lib-primary);
  transform: translateX(4px);
}

.lib-node-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--card-bg);
  color: var(--lib-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-soft);
}

[data-theme="dark"] .lib-node-icon {
  background: #1E293B;
  color: #818CF8;
}

.lib-node-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.lib-node-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.lib-flow-connector {
  width: 2px;
  height: 14px;
  background: var(--lib-primary);
  margin-left: 36px;
  opacity: 0.4;
}

/* ==========================================================================
   Section 9: Download / Final CTA
   ========================================================================== */
.lib-cta-banner {
  background: linear-gradient(135deg, #1E1B4B 0%, #0F172A 50%, #0B0F19 100%);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: 32px;
  padding: 4.5rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 25px 60px -15px rgba(15, 23, 42, 0.35);
  color: #FFFFFF;
}

.lib-cta-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 350px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.3) 0%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}

.lib-cta-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
}

.lib-cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: #FFFFFF;
  margin-bottom: 1rem;
}

.lib-cta-desc {
  font-size: 1.15rem;
  color: #CBD5E1;
  line-height: 1.6;
  margin-bottom: 2.25rem;
}

.lib-cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.lib-cta-meta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.82rem;
  color: #94A3B8;
  flex-wrap: wrap;
}

.lib-cta-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ==========================================================================
   Resource Preview Modal
   ========================================================================== */
.lib-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.lib-modal-overlay.active {
  display: flex;
  opacity: 1;
}

.lib-modal-container {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  width: 100%;
  max-width: 620px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 60px -10px rgba(0, 0, 0, 0.45);
  position: relative;
  padding: 2rem;
}

.lib-modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--bg-subtle);
  color: var(--text-main);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.lib-modal-close:hover {
  background: var(--border-light);
  color: var(--lib-primary);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1100px) {
  .lib-intro-grid,
  .lib-eco-grid,
  .lib-features-grid,
  .lib-pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .lib-steps-line {
    display: none;
  }

  .lib-steps-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .lib-showcase-container {
    grid-template-columns: 1fr;
  }

  .lib-mgmt-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .lib-hero-title {
    font-size: 2.25rem;
  }

  .lib-hero-headline {
    font-size: 1.45rem;
  }

  .lib-hero-stage {
    min-height: 480px;
  }

  .lib-phone-frame {
    width: 260px;
    height: 500px;
  }

  .lib-floating-badge {
    display: none;
  }

  .lib-intro-grid,
  .lib-eco-grid,
  .lib-features-grid,
  .lib-pillars-grid {
    grid-template-columns: 1fr;
  }

  .lib-mgmt-card {
    padding: 2rem 1.5rem;
  }

  .lib-cta-banner {
    padding: 3rem 1.5rem;
  }

  .lib-cta-title {
    font-size: 1.85rem;
  }

  .lib-step-preview-box {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
  }
}