/* ==========================================================================
   Dziś w Historii - Clean, readable styles inspired by Medium
   Mobile-first, typography-focused
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Warm, muted palette */
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-text-muted: #999999;
  --color-border: #e6e6e6;
  --color-accent: #c9463d;
  --color-accent-light: #fdf2f1;
  --color-link: #1a73e8;
  --color-link-hover: #0d47a1;

  /* Typography - generous sizing */
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Font sizes - mobile first (large!) */
  --text-xs: 0.875rem;      /* 14px */
  --text-sm: 1rem;          /* 16px */
  --text-base: 1.25rem;     /* 20px - body text */
  --text-lg: 1.5rem;        /* 24px */
  --text-xl: 1.875rem;      /* 30px */
  --text-2xl: 2.25rem;      /* 36px */
  --text-3xl: 2.75rem;      /* 44px */

  /* Line heights - comfortable reading */
  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* 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 */
  --container-max: 1200px;
  --content-max: 680px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--text-lg);
}

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

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

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

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

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

/* --------------------------------------------------------------------------
   Site 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;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.logo-icon {
  font-size: 1.5rem;
}

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

.site-nav a {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

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

.site-footer p {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

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

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

/* --------------------------------------------------------------------------
   Post Article
   -------------------------------------------------------------------------- */
.post {
  padding: var(--space-xl) 0 var(--space-3xl);
}

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

.post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-category {
  color: var(--color-accent);
  font-weight: 600;
}

.post-date {
  color: var(--color-text-muted);
}

.post-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-md);
  max-width: 18ch;
  margin-left: auto;
  margin-right: auto;
}

.post-anniversary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--color-accent-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 100px;
}

.anniversary-badge {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
}

.anniversary-year {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Post Image with Caption
   -------------------------------------------------------------------------- */
.post-image {
  margin: 0 0 var(--space-xl);
}

.post-image img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
}

.post-image figcaption {
  margin-top: var(--space-sm);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

.post-image .image-caption {
  display: block;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.post-image .image-credit {
  display: block;
  font-size: 0.75rem;
}

.post-image .image-credit a {
  color: var(--color-text-muted);
}

.post-image .image-credit a:hover {
  color: var(--color-link);
}

/* --------------------------------------------------------------------------
   Post Content - The heart of typography
   -------------------------------------------------------------------------- */
.post-content {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

.post-content p {
  margin-bottom: var(--space-lg);
}

.post-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.post-content h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.post-content ul,
.post-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
}

.post-content li {
  margin-bottom: var(--space-xs);
}

.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

/* First paragraph - slightly larger, acts as lead */
.post-content > p:first-of-type {
  font-size: calc(var(--text-base) * 1.1);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Post Footer
   -------------------------------------------------------------------------- */
.post-footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.post-source {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.source-label {
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Post Navigation
   -------------------------------------------------------------------------- */
.post-nav {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.post-nav .container {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
}

.post-nav-link {
  display: block;
  flex: 1;
  padding: var(--space-sm);
  border-radius: 8px;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.post-nav-link:hover {
  background: var(--color-bg);
  text-decoration: none;
}

.post-nav-next {
  text-align: right;
}

.nav-label {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.nav-title {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Home Page
   -------------------------------------------------------------------------- */
.home-hero {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.home-hero h1 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-sm);
}

.home-hero .lead {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 32ch;
  margin: 0 auto;
}

.home-date {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* Date Navigation */
.date-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.date-nav-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.date-nav-link:hover {
  background: var(--color-primary);
  color: white;
  text-decoration: none;
}

.date-nav-link.disabled {
  opacity: 0.3;
  pointer-events: none;
}

.nav-arrow {
  font-size: var(--text-lg);
  line-height: 1;
}

.archive-link {
  margin-top: var(--space-md);
}

.archive-link a {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.archive-link a:hover {
  color: var(--color-primary);
}

/* Archive Page */
.archive-hero {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.archive-hero h1 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-sm);
}

.archive-hero .lead {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.back-link {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.archive-list {
  padding: var(--space-xl) 0;
}

.archive-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: inherit;
  transition: background 0.2s;
}

.archive-item:first-child {
  border-top: 1px solid var(--color-border);
}

.archive-item:hover {
  background: var(--color-bg-secondary);
  margin-left: calc(-1 * var(--space-md));
  margin-right: calc(-1 * var(--space-md));
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.archive-date {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: 500;
}

.archive-count {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.archive-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: var(--space-2xl) 0;
}

/* Anniversary Sections */
.anniversary-section {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
}

.anniversary-section:first-of-type {
  border-top: none;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.section-year {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Post Cards */
.post-grid {
  display: grid;
  gap: var(--space-lg);
}

.post-card {
  background: var(--color-surface);
  border-radius: 12px;
  padding: var(--space-lg);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.post-card-link {
  text-decoration: none;
  color: inherit;
}

.post-card-link:hover {
  text-decoration: none;
}

.post-card-category {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.post-card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-snug);
  margin-bottom: var(--space-sm);
}

.post-card-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

/* Category Pages */
.category-header {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.category-header h1 {
  font-size: var(--text-2xl);
}

.posts-list {
  display: grid;
  gap: var(--space-md);
}

/* --------------------------------------------------------------------------
   Responsive - Tablet and up
   -------------------------------------------------------------------------- */
@media (min-width: 640px) {
  :root {
    --text-base: 1.375rem;   /* 22px */
    --text-2xl: 2.75rem;     /* 44px */
    --text-3xl: 3.5rem;      /* 56px */
  }

  .post-title {
    font-size: var(--text-3xl);
  }

  .post-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Responsive - Desktop
   -------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  :root {
    --space-md: 2rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
  }

  .container {
    padding: 0 var(--space-lg);
  }

  .post-content {
    font-size: 1.375rem;
  }
}

/* --------------------------------------------------------------------------
   Dark mode support (respects system preference)
   -------------------------------------------------------------------------- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-surface: #242424;
    --color-text: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #6b6b6b;
    --color-border: #333333;
    --color-accent: #e07a72;
    --color-accent-light: #3d2a29;
    --color-link: #6eb5ff;
    --color-link-hover: #a0cfff;
  }
}

/* --------------------------------------------------------------------------
   Print styles
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .post-nav {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  .post {
    padding: 0;
  }
}