/* =====================================================
   BLOG STYLESHEET
   Mirrors the design system of the main site
   ===================================================== */

/* ----- CSS VARIABLES (mirrored from main site) ----- */
:root {
  --color-primary: #2D5A4A;
  --color-primary-light: #3D7A64;
  --color-primary-dark: #1D3A32;

  --color-accent: #C4704B;
  --color-accent-rgb: 196, 112, 75;
  --color-accent-light: #D4906B;

  --color-bg: #FDFBF7;
  --color-bg-alt: #F5F0E8;
  --color-bg-card: #FFFFFF;

  --color-text: #2C2C2C;
  --color-text-muted: #5A5A5A;
  --color-text-light: #7A7A7A;

  --color-border: #E0D8CC;
  --color-border-dark: #C4B8A8;

  --font-heading: 'Source Serif 4', 'Georgia', serif;
  --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --max-width: 1100px;
  --nav-height: 70px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary-dark);
}

h1 { font-size: 2.5rem;   margin-bottom: var(--space-md); }
h2 { font-size: 1.875rem; margin-bottom: var(--space-md); }
h3 { font-size: 1.375rem; margin-bottom: var(--space-sm); }

p { margin-bottom: var(--space-sm); }
p:last-child { margin-bottom: 0; }

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

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

strong { font-weight: 600; }

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

main {
  flex: 1;
  padding: var(--space-xl) 0 var(--space-2xl);
}

/* ----- HEADER & NAVIGATION ----- */
.site-header {
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: all var(--transition-base);
}

.site-logo:hover {
  color: var(--color-primary);
  transform: translateY(-1px);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-bg-alt);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: var(--transition-fast);
}

/* ----- PAGE HEADER ----- */
.page-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 { margin-bottom: var(--space-xs); }

.page-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

/* ----- BLOG POST LIST ----- */
.blog-post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-card {
  display: block;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--transition-base);
  color: var(--color-text);
}

.post-card:hover {
  transform: translateX(4px);
  color: var(--color-text);
}

.post-card:first-child { padding-top: 0; }

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

.post-card-title {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-xs);
  line-height: 1.3;
}

.post-card:hover .post-card-title {
  color: var(--color-primary);
}

.post-card-desc {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* ----- BLOG PROSE (individual post) ----- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-lg);
  transition: color var(--transition-fast);
}

.back-link::before { content: "←"; }

.back-link:hover { color: var(--color-accent); }

.post-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.post-header h1 { margin-bottom: var(--space-xs); }

.post-meta {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.blog-prose {
  max-width: 720px;
}

.blog-prose p { margin-bottom: var(--space-md); line-height: 1.8; }

.blog-prose h2 { margin-top: var(--space-xl); }
.blog-prose h3 { margin-top: var(--space-lg); }

.blog-prose ul,
.blog-prose ol {
  margin: 0 0 var(--space-md) var(--space-lg);
}

.blog-prose li { margin-bottom: var(--space-xs); }

.blog-prose blockquote {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-primary);
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-lg) 0;
}

/* Charts and figures */
.blog-prose img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: var(--space-lg) auto;
  border-radius: var(--radius-sm);
}

/* Data tables: scroll sideways on narrow screens instead of overflowing */
.blog-prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 var(--space-md);
  font-size: 0.9375rem;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
}

.blog-prose th,
.blog-prose td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  text-align: right;
  vertical-align: bottom;
}

.blog-prose th:first-child,
.blog-prose td:first-child { text-align: left; }

.blog-prose thead th {
  font-weight: 600;
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-border-dark);
}

.blog-prose .table-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ----- COMMENTS ----- */
.comments {
  max-width: 720px;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.comments h2 { margin-bottom: var(--space-md); }

.comment-list {
  list-style: none;
  margin-bottom: var(--space-lg);
}

.comment {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.comment:first-child { padding-top: 0; }

.comment p { line-height: 1.7; margin-bottom: var(--space-xs); }

.comment .comment-meta {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.comment-author { font-weight: 600; color: var(--color-text); }

.comment-form {
  display: grid;
  gap: var(--space-sm);
}

.comment-form-note {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.comment-form label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.comment-form .optional {
  font-weight: 400;
  color: var(--color-text-light);
}

.comment-form input,
.comment-form textarea {
  width: 100%;
  font: inherit;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  color: var(--color-text);
}

.comment-form textarea { resize: vertical; }

.comment-form input:focus,
.comment-form textarea:focus {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 1px;
  border-color: var(--color-primary);
}

.comment-form button {
  justify-self: start;
  font: inherit;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.comment-form button:hover { background: var(--color-primary-dark); }
.comment-form button:disabled { opacity: 0.6; cursor: default; }

.comment-status { color: var(--color-primary); }

/* Spam-bot trap: real readers never see this field */
.comment-honeypot { display: none; }

/* ----- FOOTER ----- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.8);
  padding: var(--space-lg) 0;
  margin-top: auto;
}

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

.footer-message { font-size: 0.9375rem; }
.footer-copyright { font-size: 0.875rem; opacity: 0.7; }

/* ----- RESPONSIVE ----- */
@media (max-width: 768px) {
  h1 { font-size: 1.875rem; }

  .nav-toggle { display: block; }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-sm);
    gap: 0.25rem;
    box-shadow: var(--shadow-md);
  }

  .main-nav.open { display: flex; }

  .nav-link { padding: 0.75rem var(--space-sm); }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}