/* =============================================
   21st Memory — Main CSS (Professional Serious Archive Theme)
   Serious • Important • Humanity Knowledge
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@500;600&display=swap');

:root {
  --primary-deep: #1E1135;       /* deep professional purple-navy */
  --primary-navy: #1E1135;       /* alias for primary-deep (used in nav & section accents) */
  --primary-deep-bg: #1A0F2E;    /* cooler variant for subtle backgrounds & depth */
  --primary-purple: #5B21B6;     /* deeper static violet (avoids neon) */
  --accent-violet: #5B21B6;      /* deeper static accents for professional seriousness */
  --accent-violet-hover: #7C3AED; /* softened, elegant hover state */
  --accent-purple: #5B21B6;      /* alias for accent-violet (mobile menu hover) */
  --accent-indigo: #4F46E5;      /* clean indigo accent */
  --accent-gold: #B45309;        /* warm professional gold for emphasis */
  --accent-gold-muted: #A67C4C;  /* desaturated warm gold for subtle highlights & important badges */
  --deep-bg: #0F0A1F;            /* deep purple-black for serious depth */
  --card-bg: #1A1433;            /* solid deep purple card background */
  --text-primary: #F8FAFC;       /* clean high-contrast white */
  --text-secondary: #CBD5E1;     /* professional light slate */
  --text-body: #F1EBFF;          /* higher-contrast off-white for long reports & premium readability */
  --border-subtle: #4C3D6B;      /* subtle purple border */
  --glow: rgba(124, 58, 237, 0.25); /* subtle purple glow for scroll animations */
  --heading-gradient: linear-gradient(90deg, #5B21B6, #1E1135); /* subtle violet-to-navy for premium hero headings */
}

/* Smooth transitions */
* {
  transition-property: color, background-color, border-color, text-decoration-color, fill, stroke, transform, box-shadow;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 200ms;
}

body {
  font-family: 'Inter', system_ui, sans-serif;
  background: var(--deep-bg);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 1.05rem;
  font-feature-settings: "ss03" 1; /* premium rounded g/a for Inter */
  overflow-x: hidden;
  max-width: 100%;
  padding-top: 5rem; /* space for fixed navbar */
}

/* Desktop body font increase for premium readability */
@media (min-width: 768px) {
  body {
    font-size: 1.1rem;
  }
}

html {
  overflow-x: hidden;
  max-width: 100%;
}

/* =============================================
   PROFESSIONAL SERIOUS CARDS — Clean, trustworthy, important information feel
   ============================================= */
.memory-card,
.content-card,
.card,
.source-card,
.lesson-content-card {
  background: #1A1433;
  border: 1px solid #4C3D6B;
  border-radius: 16px;
  box-shadow: 
    0 10px 28px -12px rgba(0, 0, 0, 0.55);
  height: 100% !important;
  display: flex !important;
  flex-direction: column !important;
  padding: 1.85rem 2rem;
  position: relative;
  overflow: hidden;
}

/* Subtle top highlight for professional depth (no cosmic texture) */
.memory-card::before,
.content-card::before,
.source-card::before,
.lesson-content-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.03) 0%, transparent 40%);
  border-radius: 16px;
  pointer-events: none;
  z-index: 1;
}

/* Clean professional hover — subtle lift, no neon glow */
.memory-card:hover,
.content-card:hover,
.card:hover,
.source-card:hover,
.lesson-content-card:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 18px 36px -8px rgba(0, 0, 0, 0.65);
  border-color: var(--accent-violet-hover);
}

/* =============================================
   PROFESSIONAL NETWORK CHANNEL CARDS — Clean, serious, trustworthy
   ============================================= */

.channel-card {
  background: var(--card-bg);
  border: none;
  border-radius: 16px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  display: flex !important;
  flex-direction: column !important;
  height: 100% !important;
  min-height: 280px;
  box-shadow: 
    0 14px 45px -12px rgba(0, 0, 0, 0.7),
    0 8px 25px -8px rgba(0, 0, 0, 0.45),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.2); /* Realistic 3D bevel, depth shadows, and subtle surface highlight */
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

/* Enhanced professional top highlight for realistic 3D raised surface */
.channel-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.07) 0%, transparent 55%);
  border-radius: 16px;
  pointer-events: none;
  z-index: 1;
}

/* Hover — Premium realistic lift with deeper shadows and subtle violet depth accent */
.channel-card:hover {
  transform: translateY(-7px) scale(1.015);
  box-shadow: 
    0 28px 60px -15px rgba(0, 0, 0, 0.8),
    0 12px 30px -8px rgba(91, 33, 182, 0.25),
    inset 0 2px 0 rgba(255, 255, 255, 0.15),
    inset 0 -2px 0 rgba(0, 0, 0, 0.25);
}

/* Active / pressed state */
.channel-card:active {
  transform: translateY(-2px) scale(0.995);
  box-shadow: 
    0 10px 25px -10px rgba(0, 0, 0, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

/* Video transmission cards on deep-dive page — calm, no lift or enhanced hover (embeds should stay static) */
.video-card:hover {
  transform: none !important;
  box-shadow: 
    0 14px 45px -12px rgba(0, 0, 0, 0.7),
    0 8px 25px -8px rgba(0, 0, 0, 0.45),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.2) !important;
}

.video-card:active {
  transform: none !important;
}

/* Ensure text and icons pop on the 3D surface */
.channel-card h3 {
  color: var(--text-primary);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.channel-card p {
  flex-grow: 1 !important;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

/* Inner link text highlight on hover */
.channel-card .inline-flex {
  transition: color 0.2s ease;
}

.channel-card:hover .inline-flex {
  color: #fff;
}

/* =============================================
   END NETWORK 3D BUTTON CARDS
   ============================================= */

/* Static card — completely calm, no lift, no extra glow (professional/hero/report) */
.static-card {
  transform: none !important;
  box-shadow: 
    0 18px 45px -12px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(124, 58, 237, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.06) !important;
  border: none !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.static-card:hover {
  transform: none !important;
  box-shadow: 
    0 18px 45px -12px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(124, 58, 237, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.06) !important;
}

.static-card .btn-primary {
  box-shadow: none;
}

.static-card .btn-primary:hover {
  transform: scale(1.015);
  box-shadow: 0 0 18px rgba(59, 7, 100, 0.35), 0 6px 14px -4px rgba(59, 7, 100, 0.28);
}

/* Sources cards inner link highlight */
.content-card.group:hover .inline-flex {
  color: #fff;
  transition: all 0.2s ease;
}

/* Ensure description paragraphs in cards grow to fill space for perfect uniform height in grids */
.memory-card p,
.content-card p,
.card p,
.source-card p,
.channel-card p,
.lesson-content-card p {
  flex-grow: 1 !important;
  margin-bottom: 1.25rem;
}

/* Buttons — Premium 3D Professional CTA (Enhanced Depth & Polish for Dark Theme)
   Strong bevel, glossy highlight, realistic press/lift — serious, trustworthy, modern premium feel */
.btn-primary {
  position: relative;
  background: linear-gradient(145deg, #3B0764 0%, #4C1D95 50%, #581C87 100%);
  color: white;
  font-weight: 700;
  border-radius: 18px;
  padding: 15px 38px;
  border: none;
  box-shadow: 
    0 10px 22px -8px rgba(0, 0, 0, 0.6),
    0 6px 14px -4px rgba(59, 7, 100, 0.35),
    inset 0 2.5px 0 rgba(255, 255, 255, 0.32),
    inset 0 -5px 0 rgba(30, 17, 53, 0.7);
  transition: all 0.35s cubic-bezier(0.23, 1, 0.32, 1);
  letter-spacing: 0.02em;
  font-size: 0.95rem;
  overflow: hidden;
  z-index: 1;
}

/* Glossy top highlight layer for realistic 3D material depth */
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(255,255,255,0.26) 0%,
    rgba(255,255,255,0.09) 38%,
    transparent 68%
  );
  border-radius: 18px;
  pointer-events: none;
  z-index: 2;
  transition: background 0.3s ease;
}

.btn-primary:hover::before {
  background: linear-gradient(
    to bottom,
    rgba(255,255,255,0.36) 0%,
    rgba(255,255,255,0.13) 42%,
    transparent 72%
  );
}

.btn-primary:hover {
  background: linear-gradient(145deg, #4C1D95 0%, #581C87 50%, #6B21A8 100%);
  transform: translateY(-5px) scale(1.015);
  box-shadow: 
    0 14px 28px -10px rgba(0, 0, 0, 0.65),
    0 8px 18px -5px rgba(59, 7, 100, 0.4),
    inset 0 3px 0 rgba(255, 255, 255, 0.38),
    inset 0 -5px 0 rgba(30, 17, 53, 0.65);
}

.btn-primary:active {
  transform: translateY(2px) scale(0.98);
  box-shadow: 
    0 6px 14px -6px rgba(0, 0, 0, 0.55),
    0 3px 8px -3px rgba(59, 7, 100, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    inset 0 -3px 0 rgba(30, 17, 53, 0.75);
}

/* Micro-animation for arrows */
.btn-primary span,
.group-hover\:translate-x-1 {
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover span,
.group:hover .group-hover\:translate-x-1 {
  transform: translateX(6px);
}

/* Topic nav buttons — Professional deep purple, clean and serious */
.btn-topic-nav {
  background: linear-gradient(145deg, #2A1F40 0%, #231A35 100%);
  color: var(--text-secondary);
  border: 1px solid #4C3D6B;
  font-weight: 600;
  border-radius: 14px;
  padding: 10px 22px;
  font-size: 0.875rem;
  box-shadow: 
    0 6px 14px -5px rgba(0, 0, 0, 0.5),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.12),
    inset 0 -2px 0 rgba(0, 0, 0, 0.3);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-topic-nav:hover {
  background: linear-gradient(145deg, #3D2A5C 0%, #2A1F40 100%);
  color: #E0D4FF;
  border-color: #6B21A8;
  transform: translateY(-2px);
  box-shadow: 
    0 8px 18px -6px rgba(0, 0, 0, 0.55),
    inset 0 2px 0 rgba(255, 255, 255, 0.18),
    inset 0 -2px 0 rgba(0, 0, 0, 0.25);
}

/* Navbar - CLEAN RENDER with new palette (logo + links fixed) */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  background: rgba(30, 17, 53, 0.96);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.nav-logo-icon {
  background: var(--accent-violet);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(91, 33, 182, 0.25);
}

.nav-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1;
}

.nav-logo-subtitle {
  font-size: 0.65rem;
  color: var(--text-secondary);
  letter-spacing: 0.6px;
  margin-top: -1px;
  opacity: 0.9;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.1rem;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
}

.nav-link:hover {
  color: var(--accent-violet);
}

.nav-link.active {
  color: var(--text-primary);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--primary-navy), var(--accent-violet));
  border-radius: 2px;
}

.mobile-menu-btn:hover {
  color: var(--accent-purple);
}

/* =============================================
   MOBILE MENU — Professional dropdown for mobile
   ============================================= */
.mobile-menu {
  display: none !important;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.5rem;
  background: #0F0A1F;
  border-top: 1px solid var(--border-subtle);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  z-index: 60;
  width: 100%;
}

.mobile-menu.open {
  display: flex !important;
}

.mobile-menu .nav-link {
  display: block;
  padding: 0.85rem 1.25rem;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 10px;
  transition: all 0.2s ease;
}

.mobile-menu .nav-link:hover {
  background: rgba(91, 33, 182, 0.12);
  color: #fff;
  transform: translateX(4px);
}

.mobile-menu .nav-link.active {
  background: rgba(91, 33, 182, 0.2);
  color: var(--text-primary);
  font-weight: 600;
}

/* Ensure hamburger button is properly styled and tappable on mobile */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.mobile-menu-btn svg {
  width: 26px;
  height: 26px;
}

/* Hide desktop nav-links on mobile (reinforce for mobile menu) */
@media (max-width: 767px) {
  .nav-links {
    display: none !important;
  }
}

/* Headings */
h1, h2, h3, .section-header {
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: -0.02em;
}

h1 { font-size: 4rem; line-height: 1.04; letter-spacing: -0.03em; color: var(--text-primary); font-weight: 700; }
h2 { font-size: 2.5rem; line-height: 1.15; letter-spacing: -0.025em; color: var(--text-primary); font-weight: 700; }
h3 { font-size: 2rem; line-height: 1.25; letter-spacing: -0.02em; color: var(--text-secondary); font-weight: 600; }
.section-header { font-size: 4rem; line-height: 1.04; letter-spacing: -0.035em; color: var(--text-primary); font-weight: 700; }

@media (min-width: 768px) {
  h1 { font-size: 4.75rem; line-height: 1.03; letter-spacing: -0.045em; }
  .section-header { font-size: 4.75rem; letter-spacing: -0.045em; }
  h2 { font-size: 2.65rem; }
  h3 { font-size: 2.1rem; }
}

/* Aggressive mobile h1 reduction to prevent cramping (3.2rem → 2.8rem target) */
@media (max-width: 640px) {
  h1 { font-size: 2.8rem !important; line-height: 1.1; letter-spacing: -0.03em; }
  .section-header { font-size: 2.8rem !important; }
}

/* Utility */

.section-divider {
  background: linear-gradient(to right, transparent, #5B21B6, #1E1135, transparent);
  height: 1px;
  opacity: 0.6;
}

/* Full-bleed dividers — Robust mobile fix to prevent any horizontal overflow */
.full-bleed-divider {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  max-width: 100vw;
  margin-left: 0;
  margin-right: 0;
  padding-left: 0 !important;
  padding-right: 0 !important;
  box-sizing: border-box;
  overflow: hidden;
}

/* Shrink divider badges on very small mobile screens to guarantee perfect fit */
@media (max-width: 480px) {
  .full-bleed-divider > div[class*="px-10"],
  .full-bleed-divider > div[class*="px-8"] {
    padding-left: 0.75rem !important;
    padding-right: 0.75rem !important;
    font-size: 0.7rem !important;
    letter-spacing: 1.5px !important;
    white-space: normal !important; /* allow wrap if still tight */
    max-width: 85vw;
  }
}

/* Page overrides */
.hero-gradient {
    background: 
      linear-gradient(180deg, rgba(124, 58, 237, 0.06) 0%, transparent 100%),
      linear-gradient(135deg, rgba(91, 33, 182, 0.03) 0%, transparent 60%);
    background-size: 100% 100%;
    background-position: center;
}

/* Premium gradient headings in hero sections for expensive feel */
.hero-gradient h1,
.hero-gradient .section-header,
header.hero-gradient h1 {
  background: var(--heading-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  letter-spacing: -0.04em;
}

#about .max-w-5xl .content-card {
    margin-top: 60px !important;
}

/* Footer — Professional deep purple */
footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  text-align: center;
  background: #0F0A1F;
  color: var(--text-primary);
  box-shadow: 0 -3px 12px rgba(0, 0, 0, 0.3);
}

footer svg {
  filter: drop-shadow(0 0 10px rgba(91, 33, 182, 0.4));
}

footer .border-t {
  border-color: var(--border-subtle);
}

footer a {
  color: var(--text-secondary);
}

footer a:hover {
  color: var(--accent-violet);
}

/* Source viewer polish */
.source-text-block {
    max-width: 52ch;
}

.category-header:hover {
    border-color: var(--primary-purple);
    box-shadow: 0 10px 22px -6px rgba(124, 58, 237, 0.35);
}

.topic-item:hover {
    border-color: var(--primary-purple);
    box-shadow: 0 14px 28px -8px rgba(124, 58, 237, 0.35);
}

.topic-item:hover .font-medium {
    color: var(--accent-violet);
}

#topics-container h2::after {
    background: linear-gradient(to right, var(--primary-navy), transparent);
}

/* =============================================
   DEEP DIVE REPORT — MAXIMUM READABILITY & PROFESSIONALISM (REFINED)
   ============================================= */

#report-section .content-card {
    background: #1F1A35; /* slightly warmer, lighter deep charcoal/navy for reduced eye fatigue & premium archival feel */
    border: 1px solid #4C3D6B;
    box-shadow: 
      0 20px 50px -15px rgba(0, 0, 0, 0.6);
    position: relative;
    overflow: hidden;
}

/* Very faint paper grain texture (<2% opacity) for subtle readability depth without distraction */
#report-section .content-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
      linear-gradient(rgba(255,255,255,0.012) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.012) 1px, transparent 1px);
    background-size: 2.5px 2.5px;
    pointer-events: none;
    z-index: 1;
    border-radius: 24px; /* matches rounded-3xl in deep-dive.html */
}

#report-container {
  font-size: 1.18rem;
  line-height: 1.90;
  color: #F4F0FF; /* cooler, higher-contrast off-white for superior long-form readability on dark archival backgrounds */
  max-width: 72ch;
  margin-left: auto;
  margin-right: auto;
  font-feature-settings: "kern" 1, "liga" 1, "ss03" 1;
}

/* Desktop premium readability boost */
@media (min-width: 768px) {
  #report-container {
    font-size: 1.22rem;
  }
}

/* Mobile optimizations — wider effective reading area, reduced padding to fix cramped 3-4 word lines, touch-friendly sizing */
@media (max-width: 767px) {
  #report-section .content-card {
    padding: 1.5rem 1.25rem !important;
  }
  #report-container {
    font-size: 1.15rem;
    line-height: 1.85;
    max-width: 100%;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }
}

/* Professional, calm heading hierarchy */
#report-container h1 {
  font-size: 2.35rem !important;
  font-weight: 800;
  color: var(--text-primary) !important;
  margin-top: 0.1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--accent-violet-hover);
  letter-spacing: -0.028em;
  font-family: 'Space Grotesk', sans-serif;
  text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

#report-container h2 {
  font-size: 1.55rem !important;
  font-weight: 700;
  color: var(--text-secondary) !important;
  margin-top: 3.5rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.018em;
  font-family: 'Space Grotesk', sans-serif;
  padding-left: 0.85rem;
  border-left: 6px solid var(--accent-violet-hover);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.25); /* subtle depth for premium heading presence */
}

#report-container h3 {
  font-size: 1.22rem !important;
  font-weight: 600;
  color: var(--text-secondary) !important;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  font-family: 'Space Grotesk', sans-serif;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

#report-container p {
  margin-bottom: 1.85rem;
  color: #F4F0FF;
}

#report-container strong {
  color: #A67C4C; /* accent-gold-muted for crisp, high-contrast emphasis without purple blur/fatigue */
  font-weight: 700;
  letter-spacing: -0.005em;
}

#report-container em {
  color: var(--text-secondary);
  font-style: italic;
}

#report-container ul, 
#report-container ol {
  margin-bottom: 1.75rem;
  padding-left: 1.5rem;
}

#report-container ul li {
  position: relative;
  padding-left: 0.35rem;
}

#report-container ul li::before {
  content: '•';
  color: var(--accent-violet-hover);
  font-weight: 700;
  position: absolute;
  left: -0.9rem;
}

#report-container ol li::marker {
  color: var(--accent-violet-hover);
  font-weight: 700;
}

#report-container blockquote {
  border-left: 6px solid var(--accent-violet-hover);
  background: rgba(35, 26, 60, 0.50);
  color: #E8E0FF;
  padding: 1.5rem 2rem;
  margin: 2.25rem 0;
  font-style: italic;
  border-radius: 0 12px 12px 0;
  box-shadow: inset 3px 0 0 rgba(124, 58, 237, 0.15);
}

#report-container a {
  color: var(--text-secondary);
  text-decoration-color: var(--accent-violet);
  text-underline-offset: 3px;
}

#report-container a:hover {
  color: var(--accent-violet);
  text-decoration-color: var(--text-secondary);
}

#report-container pre,
#report-container code {
  border: 1px solid rgba(124, 58, 237, 0.25);
  background: rgba(15, 10, 30, 0.6);
  color: var(--text-secondary);
  border-radius: 8px;
}

#report-container hr {
  border: none;
  height: 1px;
  background: linear-gradient(to right, transparent, #4C3D6B, transparent);
  margin: 3.5rem 0;
  opacity: 0.55;
}

#report-container th {
  background: rgba(124, 58, 237, 0.15);
  color: var(--text-secondary);
  font-weight: 600;
}

#report-container td {
  border-color: rgba(124, 58, 237, 0.2);
}

/* Back to Top — Professional floating button (visible on scroll) */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, #3B0764, #4C1D95);
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  box-shadow: 0 10px 24px -8px rgba(59, 7, 100, 0.5);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

#back-to-top:hover {
  transform: translateY(-3px) scale(1.06);
  box-shadow: 0 14px 30px -10px rgba(59, 7, 100, 0.55);
  background: linear-gradient(135deg, #4C1D95, #581C87);
}

/* =============================================
   ACCESSIBILITY IMPROVEMENTS
   ============================================= */

:focus-visible {
  outline: 3px solid var(--accent-violet);
  outline-offset: 3px;
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.25);
}

button:focus-visible,
a:focus-visible,
[role="button"]:focus-visible,
[role="link"]:focus-visible {
  outline: 3px solid var(--accent-violet);
  outline-offset: 3px;
}

.text-\[var(--text-secondary)\] { color: var(--text-secondary); }

#infographic-modal button:focus-visible {
  outline: 4px solid var(--text-primary) !important;
  outline-offset: 4px;
  box-shadow: 0 0 0 6px rgba(168, 85, 247, 0.55);
}

#back-to-top:focus-visible {
  outline: 3px solid var(--text-primary);
  outline-offset: 4px;
}

.btn-primary:focus-visible,
.btn-topic-nav:focus-visible,
a.content-card:focus-visible,
a.channel-card:focus-visible,
a.source-card:focus-visible {
  outline: 3px solid var(--accent-violet);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.45);
}

iframe:focus-visible {
  outline: 3px solid var(--accent-violet);
  outline-offset: 2px;
}

/* =============================================
   CONSOLIDATED REUSABLE CLASSES
   ============================================= */

.source-card {
  padding: 2rem;
  display: block;
  text-decoration: none;
}

.secondary-btn {
  background: linear-gradient(145deg, #2E1065 0%, #3B0764 100%);
  color: var(--text-secondary);
  border: 1px solid #4C1D95;
  font-weight: 600;
  border-radius: 16px;
  padding: 0.8rem 1.65rem;
  font-size: 0.875rem;
  box-shadow: 
    0 8px 18px -6px rgba(0, 0, 0, 0.55),
    0 4px 10px -4px rgba(59, 7, 100, 0.3),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.18),
    inset 0 -3px 0 rgba(30, 17, 53, 0.6);
  transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.secondary-btn:hover {
  background: linear-gradient(145deg, #3B0764 0%, #4C1D95 100%);
  color: var(--text-primary);
  border-color: #6B21A8;
  box-shadow: 
    0 10px 22px -8px rgba(0, 0, 0, 0.6),
    0 5px 12px -4px rgba(59, 7, 100, 0.35),
    inset 0 2px 0 rgba(255, 255, 255, 0.24),
    inset 0 -3px 0 rgba(30, 17, 53, 0.55);
  transform: translateY(-3px) scale(1.015);
}

/* =============================================
   SCROLL ANIMATIONS (Intersection Observer driven)
   ============================================= */

/* Scroll-triggered fade-in + lift for content cards (static cards excluded for calm professional feel) */
.section-card:not(.channel-card) {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 0.65s cubic-bezier(0.4, 0, 0.2, 1), 
              transform 0.65s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.65s ease;
}

.section-card.visible:not(.channel-card) {
  opacity: 1;
  transform: translateY(0);
  box-shadow: 0 12px 35px -12px var(--glow);
}

/* =============================================
   MICRO-INTERACTIONS & LOADING FEEDBACK (Premium Feel)
   ============================================= */

/* Subtle shimmer for cards during dynamic JSON content load (topics, codex, etc.) */
.loading-shimmer {
  position: relative;
  overflow: hidden;
}
.loading-shimmer::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 20%,
    rgba(255, 255, 255, 0.06) 50%,
    transparent 80%
  );
  animation: card-shimmer 1.8s ease-in-out infinite;
  pointer-events: none;
}
@keyframes card-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(300%); }
}

/* Enhanced crisp focus states for all interactive elements (elevated from base) */
button:focus-visible,
a:focus-visible,
[role="button"]:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid #7C3AED;
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.2);
  transition: box-shadow 0.15s ease;
}

/* =============================================
   SOURCE VIEWER — 3D TOPIC BUTTONS (Premium Archive Treatment)
   Subtler material depth, realistic matte cardstock/metal finish, calm premium lift
   ============================================= */

/* Large root topic cards — premium professional entry points with refined 3D depth */
.topic-root-card {
  background: #1A1433;
  border: none;
  border-radius: 18px;
  padding: 1.7rem 1.9rem;
  box-shadow: 
    0 12px 32px -14px rgba(0, 0, 0, 0.65),
    0 5px 14px -6px rgba(0, 0, 0, 0.45),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.09),
    inset 0 -1px 0 rgba(0, 0, 0, 0.18);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  max-width: 100%;
  min-height: 215px;
  height: auto !important;
}

/* Subtle consistent top-edge highlight (1-2px white gradient <10% opacity) — visible resting, brightens on hover */
.topic-root-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(to bottom, rgba(255,255,255,0.065) 0%, transparent 48%),
    linear-gradient(to right, rgba(255,255,255,0.08) 0%, transparent 12%);
  border-radius: 18px;
  pointer-events: none;
  z-index: 1;
}

.topic-root-card:hover {
  transform: translateY(-4px) scale(1.008);
  box-shadow: 
    0 20px 48px -12px rgba(0, 0, 0, 0.75),
    0 10px 26px -8px rgba(91, 33, 182, 0.18),
    inset 0 2px 0 rgba(255, 255, 255, 0.13),
    inset 0 -1.5px 0 rgba(0, 0, 0, 0.22);
}

/* Refined typography hierarchy & breathing room for premium tile feel */
.topic-root-card h3 {
  font-weight: 700;
  letter-spacing: -0.028em;
  line-height: 1.05;
}

.topic-root-card .root-icon {
  width: 100px;
  height: 100px;
  font-size: 2.8rem;
  background: #120A2E;
  border: 2px solid var(--accent-violet);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #E0D4FF;
  flex-shrink: 0;
  box-shadow: 0 10px 30px rgba(91, 33, 182, 0.35);
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
  margin-right: 0.35rem; /* refined breathing room */
}

.topic-root-card:hover .root-icon {
  transform: scale(1.03);
  box-shadow: 0 14px 40px rgba(91, 33, 182, 0.42);
  border-color: #8B3DFF;
}

.topic-root-card .root-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 16px;
  display: block;
}

.topic-root-card .explore-badge {
  background: linear-gradient(145deg, #3B0764 0%, #4C1D95 100%);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 9px 22px;
  border-radius: 14px;
  box-shadow: 0 4px 10px -3px rgba(59, 7, 100, 0.4);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.topic-root-card:hover .explore-badge {
  background: linear-gradient(145deg, #4C1D95 0%, #581C87 100%);
  transform: scale(1.02);
  box-shadow: 0 6px 14px -4px rgba(59, 7, 100, 0.42);
}

/* Category toggle buttons — Clean professional deep purple with refined 3D */
.category-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0.9rem 1.5rem;
  background: linear-gradient(145deg, #2A1F40 0%, #231A35 100%);
  border: none;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.97rem;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  box-shadow: 
    0 9px 20px -8px rgba(0, 0, 0, 0.6),
    0 4px 11px -5px rgba(0, 0, 0, 0.4),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.2);
}

/* Subtle top-edge highlight */
.category-toggle::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.075) 0%, transparent 52%);
  border-radius: 12px;
  pointer-events: none;
  z-index: 1;
}

.category-toggle:hover {
  background: linear-gradient(145deg, #3D2A5C 0%, #2A1F40 100%);
  border-color: #6B21A8;
  color: #E0D4FF;
  transform: translateY(-3px) scale(1.008);
  box-shadow: 
    0 14px 28px -10px rgba(0, 0, 0, 0.65),
    0 7px 16px -6px rgba(59, 7, 100, 0.25),
    inset 0 2px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1.5px 0 rgba(0, 0, 0, 0.2);
}

.category-toggle:active {
  transform: translateY(-2px) scale(0.995);
  box-shadow: 
    0 6px 14px -6px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.category-toggle .chevron {
  font-size: 1.05rem;
  color: var(--accent-violet);
  transition: transform 0.25s ease;
  position: relative;
  z-index: 2;
}

.category-toggle:hover .chevron {
  transform: translateX(4px);
}

/* Leaf topic buttons (pills) — Premium refined 3D with generous whitespace */
.topic-leaf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 11px 20px;
  min-height: 44px;
  background: linear-gradient(145deg, #2A1F40 0%, #231A35 100%);
  border: none;
  border-radius: 14px;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: -0.008em;
  color: var(--text-primary);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  box-shadow: 
    0 8px 18px -7px rgba(0, 0, 0, 0.6),
    0 3px 9px -4px rgba(0, 0, 0, 0.4),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.18);
}

/* Subtle top-edge highlight */
.topic-leaf-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.065) 0%, transparent 55%);
  border-radius: 14px;
  pointer-events: none;
  z-index: 1;
}

.topic-leaf-btn:hover {
  transform: translateY(-3px) scale(1.008);
  background: linear-gradient(145deg, #3D2A5C 0%, #2A1F40 100%);
  border-color: #6B21A8;
  color: #E0D4FF;
  box-shadow: 
    0 12px 26px -9px rgba(0, 0, 0, 0.65),
    0 6px 14px -5px rgba(59, 7, 100, 0.22),
    inset 0 2px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1.5px 0 rgba(0, 0, 0, 0.18);
}

.topic-leaf-btn:active {
  transform: translateY(-1px) scale(0.985);
  box-shadow: 
    0 5px 12px -5px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

/* Inner text highlight on hover for leaf buttons */
.topic-leaf-btn:hover span {
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* =============================================
   PRINT / PDF STYLES — ROBUST & RELIABLE
   ============================================= */
@media print {
  /* Hide everything we don't want in the PDF */
  nav, footer, header, .navbar, .mobile-menu,
  #videos-section, #infographics-section,
  #pdf-preview-container, #pdf-container,
  #back-to-top, #infographic-modal,
  .btn-primary, .print-exclude {
    display: none !important;
  }

  /* Force the report (and ALL its children) to be visible */
  .content-card.static-card.lesson-content-card,
  #report-section,
  #report-container,
  #report-section *,
  #report-container * {
    display: block !important;
    visibility: visible !important;
  }

  /* Reset positioning & sizing */
  #report-section {
    position: static !important;
    left: auto;
    top: auto;
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 30px 0 !important;
  }

  /* White background + dark text for clean PDF */
  .content-card.static-card.lesson-content-card,
  #report-section .content-card {
    background: #ffffff !important;
    color: #111111 !important;
    box-shadow: none !important;
    border: 1px solid #cccccc !important;
    padding: 40px !important;
    page-break-inside: avoid;
  }

  /* Report typography */
  #report-container {
    max-width: 100% !important;
    color: #111111 !important;
    font-size: 11pt !important;
    line-height: 1.65 !important;
  }

  #report-container h1,
  #report-container h2,
  #report-container h3 {
    color: #000000 !important;
  }

  #report-container p,
  #report-container ul,
  #report-container ol,
  #report-container li,
  #report-container strong,
  #report-container em,
  #report-container span,
  #report-container blockquote {
    color: #222222 !important;
  }

  #report-container pre,
  #report-container code {
    background: #f4f4f5 !important;
    color: #111111 !important;
    border-color: #d1d5db !important;
  }

  body {
    background: #ffffff !important;
    color: #111111 !important;
  }

  /* Optional: nicer margins for PDF */
  @page {
    margin: 0.75in;
  }
}