/* ============================================
   Lenny's Podcast Knowledge Base
   Premium Dark Theme Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── CSS Custom Properties ── */
:root {
  --bg-primary: #fdfbf7;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-hover: rgba(255, 255, 255, 1);
  --border-glass: rgba(0, 0, 0, 0.06);
  --border-glass-hover: rgba(0, 0, 0, 0.12);
  --text-primary: #2d3436;
  --text-secondary: #57606f;
  --text-muted: #8b929e;
  --accent-coral: #e17055;
  --accent-purple: #6c5ce7;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 40px rgba(225, 112, 85, 0.15);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ── Animated Background ── */
.bg-ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-ambient::before {
  content: '';
  position: absolute;
  top: -200px;
  left: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(225, 112, 85, 0.05) 0%, transparent 70%);
  /* Soft Peach */
  animation: floatOrb 20s ease-in-out infinite;
}

.bg-ambient::after {
  content: '';
  position: absolute;
  bottom: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(253, 203, 110, 0.05) 0%, transparent 70%);
  /* Soft Yellow */
  animation: floatOrb 25s ease-in-out infinite reverse;
}

@keyframes floatOrb {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  25% {
    transform: translate(80px, -60px) scale(1.1);
  }

  50% {
    transform: translate(-40px, 80px) scale(0.9);
  }

  75% {
    transform: translate(60px, 40px) scale(1.05);
  }
}

/* ── Main Container ── */
.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

/* ── Hero Section ── */
.hero {
  padding: 80px 40px 40px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 100px;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
  animation: fadeSlideDown 0.6s ease-out;
}

.hero-badge span {
  font-size: 16px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 18px;
  animation: fadeSlideDown 0.7s ease-out 0.1s both;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, #e17055, #d63031, #e84393);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  font-weight: 400;
  animation: fadeSlideDown 0.7s ease-out 0.2s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 36px;
  animation: fadeSlideDown 0.7s ease-out 0.3s both;
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-top: 4px;
}

/* ── Search Bar ── */
.search-container {
  max-width: 480px;
  margin: 0 auto;
  position: relative;
  animation: fadeSlideDown 0.7s ease-out 0.4s both;
}

.search-input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 100px;
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: rgba(108, 92, 231, 0.4);
  box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.08), 0 0 30px rgba(108, 92, 231, 0.1);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
  pointer-events: none;
}

/* ── Breadcrumb ── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 40px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-muted);
  animation: fadeIn 0.3s ease-out;
}

.breadcrumb-item {
  cursor: pointer;
  transition: var(--transition-fast);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.breadcrumb-item:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.breadcrumb-item.active {
  color: var(--text-secondary);
  cursor: default;
}

.breadcrumb-item.active:hover {
  background: none;
  color: var(--text-secondary);
}

.breadcrumb-sep {
  opacity: 0.3;
}

/* ── Category Grid ── */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 0 40px 80px;
  max-width: 1300px;
  margin: 0 auto;
}

.category-panel {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 28px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: transform var(--transition-spring), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  animation: fadeSlideUp 0.5s ease-out both;
}

.category-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.category-panel:hover {
  transform: translateY(-6px) scale(1.01);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-lg);
}

.category-panel:hover::before {
  opacity: 1;
}

.category-panel:active {
  transform: translateY(-2px) scale(0.99);
}

.panel-icon {
  font-size: 2.4rem;
  margin-bottom: 14px;
  display: block;
  filter: saturate(1.2);
  animation: pulseIcon 3s ease-in-out infinite;
}

@keyframes pulseIcon {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.06);
  }
}

.panel-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.panel-description {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 18px;
}

.panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-count {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.panel-count strong {
  color: var(--text-secondary);
  font-size: 18px;
}

.panel-arrow {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-muted);
  transition: all var(--transition-smooth);
}

.category-panel:hover .panel-arrow {
  transform: translateX(4px);
  border-color: var(--border-glass-hover);
  color: var(--text-secondary);
}

/* ── Guest Cards Section ── */
.cards-section {
  padding: 0 40px 80px;
  max-width: 1300px;
  margin: 0 auto;
}

.cards-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  animation: fadeSlideDown 0.4s ease-out;
}

.cards-header-icon {
  font-size: 2.4rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
}

.cards-header-info h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.cards-header-info p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.guest-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 22px;
  cursor: pointer;
  transition: all var(--transition-spring);
  position: relative;
  overflow: hidden;
  animation: fadeSlideUp 0.4s ease-out both;
}

.guest-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  border-radius: 3px 0 0 3px;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.guest-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
  background: var(--bg-glass-hover);
}

.guest-card:hover::after {
  opacity: 1;
}

.guest-card:active {
  transform: translateY(-1px) scale(0.99);
}

.guest-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 14px;
  position: relative;
}

.guest-avatar::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: inherit;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.guest-card:hover .guest-avatar::after {
  opacity: 0.4;
}

.guest-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.detail-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.guest-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.guest-topic {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.guest-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.06);
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

/* ── Detail View (Modal) ── */
.detail-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.detail-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.detail-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 720px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(30px) scale(0.95);
  transition: transform var(--transition-spring);
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.1) transparent;
}

.detail-overlay.active .detail-panel {
  transform: translateY(0) scale(1);
}

.detail-panel::-webkit-scrollbar {
  width: 6px;
}

.detail-panel::-webkit-scrollbar-track {
  background: transparent;
}

.detail-panel::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 3px;
}

.detail-close {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: flex-end;
  padding: 20px 24px 0;
}

.detail-close-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px);
}

.detail-close-btn:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: var(--border-glass-hover);
}

.detail-content {
  padding: 10px 36px 40px;
}

.detail-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 20px;
}

.detail-category-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.detail-name {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.detail-topic {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.5;
}

.detail-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.detail-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 100px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--text-secondary);
}

.detail-divider {
  height: 1px;
  background: var(--border-glass);
  margin-bottom: 28px;
}

.detail-section-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.detail-transcript {
  padding: 20px 24px;
  background: rgba(0, 0, 0, 0.03);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  margin-bottom: 24px;
}

.detail-transcript p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.detail-transcript p:last-child {
  margin-bottom: 0;
}

.detail-transcript .speaker {
  font-weight: 700;
  color: var(--text-primary);
}

.detail-transcript .speaker.host {
  color: var(--accent-purple);
}

.detail-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.detail-info-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}

.detail-info-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.detail-info-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

/* ── Back Button ── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition-fast);
  margin-bottom: 24px;
  backdrop-filter: blur(12px);
}

.back-btn:hover {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-hover);
  transform: translateX(-3px);
}

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
}

/* ── Keyframe Animations ── */
@keyframes fadeSlideDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes shimmer {
  0% {
    background-position: -100% 0;
  }

  100% {
    background-position: 200% 0;
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero {
    padding: 60px 20px 32px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .category-grid {
    padding: 0 20px 60px;
    grid-template-columns: 1fr;
  }

  .cards-section {
    padding: 0 20px 60px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .breadcrumb {
    padding: 0 20px;
  }

  .detail-overlay {
    padding: 16px;
  }

  .detail-content {
    padding: 10px 24px 32px;
  }

  .detail-info-grid {
    grid-template-columns: 1fr;
  }

  .detail-name {
    font-size: 1.4rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 12px;
  }
}

/* ── Utility: Stagger Delays ── */
.stagger-1 {
  animation-delay: 0.05s;
}

.stagger-2 {
  animation-delay: 0.1s;
}

.stagger-3 {
  animation-delay: 0.15s;
}

.stagger-4 {
  animation-delay: 0.2s;
}

.stagger-5 {
  animation-delay: 0.25s;
}

.stagger-6 {
  animation-delay: 0.3s;
}

.stagger-7 {
  animation-delay: 0.35s;
}

.stagger-8 {
  animation-delay: 0.4s;
}

.stagger-9 {
  animation-delay: 0.45s;
}

.stagger-10 {
  animation-delay: 0.5s;
}

.stagger-11 {
  animation-delay: 0.55s;
}

.stagger-12 {
  animation-delay: 0.6s;
}

.stagger-13 {
  animation-delay: 0.65s;
}