/* ============================================================
   Alexa's Input (AI) — Podcast Website
   Based on Inferra Design System
   ============================================================ */

/* Design System Tokens */
:root {
  /* Colors - Dark theme from Inferra */
  --gray-1000: #08090B;
  --gray-950:  #0C0E12;
  --gray-900:  #111318;
  --gray-850:  #161A20;
  --gray-800:  #1C2128;
  --gray-700:  #262C35;
  --gray-600:  #353C47;
  --gray-500:  #4B5562;
  --gray-400:  #6B7686;
  --gray-300:  #8B95A4;
  --gray-200:  #AEB6C2;
  --gray-100:  #D2D7DF;
  --gray-50:   #EDEFF3;
  --white:     #FBFCFE;

  /* Brand - Indigo */
  --brand-100: #E0E3FF;
  --brand-200: #BEC4FF;
  --brand-300: #9AA3FF;
  --brand-400: #7C8AFF;
  --brand-500: #5B6CF0;
  --brand-600: #4453D9;
  --brand-700: #343FB0;

  /* Semantic colors */
  --green-400: #4FE0A0;
  --green-500: #2FB67E;
  --cyan-400:  #46D6D6;
  --cyan-500:  #1FAFAF;

  /* Surface layers */
  --surface-app:       var(--gray-1000);
  --surface-base:      var(--gray-900);
  --surface-raised:    var(--gray-850);
  --surface-elevated:  var(--gray-800);
  --surface-overlay:   var(--gray-700);
  --surface-hover:     rgba(255, 255, 255, 0.04);
  --surface-active:    rgba(255, 255, 255, 0.07);

  /* Text */
  --text-primary:   var(--gray-50);
  --text-secondary: var(--gray-300);
  --text-tertiary:  var(--gray-400);
  --text-disabled:  var(--gray-500);
  --text-brand:     var(--brand-300);

  /* Borders */
  --border-subtle:  rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.10);
  --border-strong:  rgba(255, 255, 255, 0.16);
  --border-brand:   var(--brand-500);

  /* Brand actions */
  --accent:          var(--brand-500);
  --accent-hover:    var(--brand-400);
  --accent-soft:     rgba(91, 108, 240, 0.14);

  /* Compute accent (for AI theme) */
  --compute:        var(--cyan-500);
  --compute-text:   var(--cyan-400);
  --compute-soft:   rgba(31, 175, 175, 0.14);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Droid Sans Mono', monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;
  --space-10: 64px;
  --space-12: 96px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);
  --glow-brand: 0 0 20px rgba(91, 108, 240, 0.4);
}

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

body {
  font-family: var(--font-sans);
  background: var(--surface-app);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Header */
.header {
  padding: var(--space-8) 0 var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

.logo-text {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.tagline {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Hero Section */
.hero {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-content {
  max-width: 800px;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--brand-300) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  max-width: 700px;
}

.cta-group {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: var(--glow-brand);
}

.btn-secondary {
  background: var(--surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-secondary:hover {
  background: var(--surface-overlay);
  border-color: var(--border-strong);
}

.icon {
  width: 18px;
  height: 18px;
}

/* Episodes Section */
.episodes {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.link-with-arrow {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--text-brand);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: gap 0.2s ease;
}

.link-with-arrow:hover {
  gap: var(--space-2);
}

.arrow-icon {
  width: 16px;
  height: 16px;
}

.episode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

.episode-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.episode-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.video-embed {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  background: var(--surface-inset);
}

.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.episode-content {
  padding: var(--space-4);
}


.episode-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--text-primary);
  line-height: 1.4;
}

.episode-tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.tag {
  font-size: 11px;
  padding: 4px 8px;
  background: var(--accent-soft);
  color: var(--text-brand);
  border-radius: 6px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* About Section */
.about {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.about-content {
  max-width: 900px;
}

.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-8);
  margin-top: var(--space-6);
}

.about-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.about-description strong {
  color: var(--text-primary);
  font-weight: 600;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stat-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: var(--space-5);
  text-align: center;
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--brand-300);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  line-height: 1.5;
}

/* Subscribe Section */
.subscribe {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.subscribe-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.subscribe-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.subscribe-description {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

.platform-links {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.platform-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-5);
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s ease;
  min-width: 120px;
}

.platform-link:hover {
  background: var(--surface-elevated);
  border-color: var(--border-brand);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.platform-icon {
  width: 32px;
  height: 32px;
  color: var(--text-brand);
}

.platform-link span {
  font-size: 14px;
  font-weight: 500;
}

/* Footer */
.footer {
  padding: var(--space-8) 0;
}

.footer-content {
  text-align: center;
}

.footer-text {
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

.footer-tagline {
  font-size: 13px;
  color: var(--text-disabled);
  font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 36px;
  }

  .hero-description {
    font-size: 16px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

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

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

  .platform-links {
    flex-direction: column;
  }

  .platform-link {
    width: 100%;
  }
}