/* ===========================
   CSS Variables & Design System
   =========================== */

:root {
  /* Colors */
  --color-background: #faf9f7;
  --color-surface: #ffffff;
  --color-text-primary: #2a2a2a;
  --color-text-secondary: #5a5a5a;
  --color-text-muted: #8a8a8a;
  --color-accent: #6b7c8a;
  --color-accent-hover: #556571;
  --color-border: #e5e3df;
  --color-border-light: #f0eee9;

  /* Typography */
  --font-serif: 'Iowan Old Style', 'Palatino Linotype', 'URW Palladio L', P052, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --max-width-content: 720px;
  --max-width-wide: 1200px;
  --border-radius: 4px;

  /* Transitions */
  --transition-base: 150ms ease-in-out;
}

/* ===========================
   Reset & Base Styles
   =========================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  background-image: url('background-pattern.svg');
  background-repeat: repeat;
  background-attachment: fixed;
  background-size: 400px 400px;
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.875rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1.375rem;
  margin-top: var(--space-lg);
}

h4 {
  font-size: 1.125rem;
  margin-top: var(--space-md);
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

em {
  font-style: italic;
}

/* ===========================
   Layout Components
   =========================== */

.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-wide {
  max-width: var(--max-width-wide);
}

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.95);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo {
  width: 1.25em;
  height: 1.25em;
  stroke: var(--color-accent);
  flex-shrink: 0;
}

.site-title:hover {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
  flex-wrap: wrap;
}

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

.site-nav a:hover {
  color: var(--color-accent);
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-3xl);
  padding: var(--space-xl) 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

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

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

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

/* ===========================
   Content Components
   =========================== */

.hero {
  text-align: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-lg);
}

.button {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

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

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

.button-secondary {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-border);
}

.button-secondary:hover {
  border-color: var(--color-accent);
  background: rgba(107, 124, 138, 0.05);
}

/* Section */
.section {
  padding: var(--space-2xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-intro {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* Steps / How it Works */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.step-item {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: white;
  border-radius: 50%;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.step-title {
  font-size: 1.125rem;
  margin-bottom: var(--space-xs);
  font-family: var(--font-serif);
}

.step-description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  display: block;
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.card-description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.card-meta {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  flex-wrap: wrap;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.card-tags {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  flex: 1;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background: var(--color-border-light);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  border-radius: 3px;
  font-weight: 500;
}

.read-time {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Callout Box */
.callout {
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  text-align: center;
}

.callout-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.callout-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.callout .button {
  margin-top: var(--space-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

li {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

li strong {
  color: var(--color-text-primary);
}

.list-clean {
  list-style: none;
  padding-left: 0;
}

.list-clean li {
  padding-left: 1.5rem;
  position: relative;
}

.list-clean li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* Framework Page Specific */
.framework-header {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.framework-title {
  margin-bottom: var(--space-sm);
}

.framework-purpose {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-style: italic;
  max-width: 600px;
  margin: 0 auto;
}

.framework-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-md) var(--space-2xl);
}

.framework-section {
  margin-bottom: var(--space-2xl);
}

.framework-section:last-child {
  margin-bottom: 0;
}

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

.example-item {
  background: var(--color-surface);
  border-left: 3px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius);
}

.example-domain {
  font-weight: 600;
  color: var(--color-accent);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.example-text {
  color: var(--color-text-secondary);
}

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

.book-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: border-color var(--transition-base);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.book-item:hover {
  border-color: var(--color-accent);
}

.book-cover {
  flex-shrink: 0;
  width: 85px;
  height: auto;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 3px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  background: var(--color-border-light);
}

.book-info {
  flex: 1;
  min-width: 0;
}

.book-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  margin-top: 0;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.book-author {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--space-sm);
}

.book-description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.book-link {
  font-size: 0.9375rem;
  font-weight: 500;
}

@media (max-width: 480px) {
  .book-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .book-cover {
    width: 100px;
    height: auto;
    margin-bottom: var(--space-sm);
  }
}

.related-frameworks {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.related-frameworks a {
  display: block;
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  color: var(--color-text-primary);
}

.related-frameworks a:hover {
  border-color: var(--color-accent);
  background: rgba(107, 124, 138, 0.02);
}

/* Search */
.search-box {
  margin-bottom: var(--space-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.search-input {
  width: 100%;
  padding: 0.875rem var(--space-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-base);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

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

/* Page Header */
.page-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  text-align: center;
}

.page-title {
  margin-bottom: var(--space-sm);
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Content Sections */
.content-section {
  margin-bottom: var(--space-2xl);
}

.content-section:last-child {
  margin-bottom: 0;
}

/* Disclosure Notice */
.disclosure-notice {
  background: rgba(107, 124, 138, 0.08);
  border-left: 4px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-xl);
  border-radius: var(--border-radius);
}

.disclosure-notice p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* Reading List Categories */
.reading-category {
  margin-bottom: var(--space-2xl);
}

.category-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .site-nav {
    gap: var(--space-md);
  }

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

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

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }
}

/* ===========================
   Accessibility
   =========================== */

.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;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===========================
   Newsletter Form (ConvertKit)
   =========================== */

.newsletter-form {
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  margin: var(--space-xl) 0;
  text-align: center;
}

.newsletter-form-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.newsletter-form-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  font-size: 1rem;
}

.newsletter-form .formkit-fields {
  display: flex;
  gap: var(--space-sm);
  max-width: 500px;
  margin: 0 auto var(--space-md);
  flex-wrap: wrap;
}

.newsletter-form .formkit-field {
  flex: 1 1 250px;
}

.newsletter-form .formkit-input {
  width: 100%;
  padding: 0.875rem var(--space-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-background);
  color: var(--color-text-primary);
  transition: border-color var(--transition-base);
}

.newsletter-form .formkit-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.newsletter-form .formkit-input::placeholder {
  color: var(--color-text-muted);
}

.newsletter-form .formkit-submit {
  padding: 0.875rem var(--space-lg);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-sans);
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color var(--transition-base);
  flex-shrink: 0;
}

.newsletter-form .formkit-submit:hover {
  background: var(--color-accent-hover);
}

.newsletter-form .formkit-submit:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.newsletter-form-guarantee {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

.newsletter-form .formkit-alert {
  padding: var(--space-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-md);
  list-style: none;
}

.newsletter-form .formkit-alert:empty {
  display: none;
}

.newsletter-form .formkit-alert-success {
  background: #d3fbeb;
  color: #0c905c;
}

.newsletter-form .formkit-alert-error {
  background: transparent;
  color: #ea4110;
}

.newsletter-form .formkit-alert-error:not(:empty) {
  background: #fde8e2;
}

.newsletter-form .formkit-spinner {
  display: none;
}

.newsletter-form .formkit-powered-by-convertkit-container {
  display: none;
}

@media (max-width: 600px) {
  .newsletter-form .formkit-fields {
    flex-direction: column;
  }

  .newsletter-form .formkit-submit {
    width: 100%;
  }
}