/* The Best 2 Podcast - Premium Design System */
/* Inspired by Stripe, Notion, premium Substack */

:root {
  /* Color System - Minimal, refined */
  --color-bg: #ffffff;
  --color-bg-soft: #fafafa;
  --color-bg-muted: #f5f5f5;
  --color-text: #111111;
  --color-text-secondary: #666666;
  --color-text-muted: #888888;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;
  --color-accent: #dc2626;
  --color-accent-dark: #b91c1c;
  
  /* Typography - Clean, professional */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing - Generous, intentional */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset */
*, *::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: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* Typography Scale */
.text-display {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.text-body {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.text-small {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-text);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: #333;
  transform: translateY(-1px);
}

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

.btn-accent:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-text-secondary);
  background: var(--color-bg-soft);
}

/* Hero Section */
.hero {
  padding: calc(64px + var(--space-24)) 0 var(--space-24);
  background: var(--color-bg);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
}

.hero-content h1 {
  margin-bottom: var(--space-6);
}

.hero-content p {
  margin-bottom: var(--space-8);
  max-width: 480px;
}

@media (max-width: 768px) {
  .hero-content p {
    max-width: 100%;
  }
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero-actions {
    justify-content: center;
  }
}

.hero-artwork {
  position: relative;
}

.hero-artwork img {
  width: 100%;
  max-width: 400px;
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

/* Featured Episode */
.featured {
  padding: var(--space-24) 0;
  background: var(--color-bg-soft);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.featured-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.featured-label {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
}

.featured-card {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-8);
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.featured-card:hover {
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
  .featured-card {
    grid-template-columns: 1fr;
  }
}

.featured-image {
  position: relative;
  aspect-ratio: 1;
}

.featured-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-content {
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-content h2 {
  margin-bottom: var(--space-4);
}

.featured-content p {
  margin-bottom: var(--space-6);
}

/* Episode Library */
.library {
  padding: var(--space-24) 0;
}

.library-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
}

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

.episode-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-6);
  align-items: center;
  padding: var(--space-5);
  background: white;
  border: 1px solid var(--color-border-light);
  border-radius: 12px;
  transition: all var(--transition-base);
}

.episode-item:hover {
  border-color: var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.episode-number {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  min-width: 60px;
}

.episode-info h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.episode-info h3:hover {
  color: var(--color-accent);
}

.episode-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.episode-play {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-soft);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.episode-play:hover {
  background: var(--color-accent);
  color: white;
}

/* About Section */
.about {
  padding: var(--space-24) 0;
  background: var(--color-bg-soft);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

.about-content h2 {
  margin-bottom: var(--space-6);
}

.about-content p {
  margin-bottom: var(--space-4);
}

.about-image img {
  border-radius: 16px;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.1);
}

/* Platforms */
.platforms {
  padding: var(--space-16) 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border-light);
}

.platforms p {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-6);
}

.platform-list {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.platform-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.platform-item:hover {
  border-color: var(--color-text-secondary);
  transform: translateY(-2px);
}

/* Newsletter */
.newsletter {
  padding: var(--space-24) 0;
  text-align: center;
}

.newsletter h2 {
  margin-bottom: var(--space-4);
}

.newsletter > p {
  margin-bottom: var(--space-8);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.newsletter-form {
  display: flex;
  gap: var(--space-3);
  max-width: 480px;
  margin: 0 auto;
}

@media (max-width: 480px) {
  .newsletter-form {
    flex-direction: column;
  }
}

.newsletter-form input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.newsletter-form input:focus {
  border-color: var(--color-text-secondary);
}

/* Footer */
.footer {
  padding: var(--space-12) 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border-light);
}

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

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* Episode Page */
.episode-page {
  padding-top: calc(64px + var(--space-16));
  padding-bottom: var(--space-24);
}

.episode-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.episode-header .episode-number {
  display: inline-block;
  margin-bottom: var(--space-4);
}

.episode-header h1 {
  max-width: 800px;
  margin: 0 auto var(--space-4);
}

.episode-video {
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: var(--space-12);
  border: 1px solid var(--color-border);
}

.episode-video iframe {
  width: 100%;
  aspect-ratio: 16/9;
  border: none;
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}