/* ==========================================================================
   CSS Custom Properties
   ========================================================================== */

:root {
  --color-bg: #F7F7F7;
  --color-header-footer: #1F1F1F;
  --color-accent: #0066CC;
  --color-accent-hover: #0052a3;
  --color-text: #222222;
  --color-text-muted: #555555;
  --color-text-light: #888888;
  --color-border: #e0e0e0;
  --color-white: #ffffff;
  --color-code-bg: #1e1e1e;
  --color-code-text: #d4d4d4;
  --color-code-border: #333333;
  --color-sidebar-bg: #ffffff;
  --color-toc-bg: #f0f4f8;
  --color-toc-border: #c8d6e5;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, "Courier New", monospace;

  --max-width: 1200px;
  --content-width: 760px;
  --sidebar-width: 300px;
  --header-height: 72px;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --transition: 0.2s ease;
}

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

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover,
a:focus {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-top: 0;
}

h1 { font-size: 2.25rem; margin-bottom: var(--spacing-lg); }
h2 { font-size: 1.75rem; margin-bottom: var(--spacing-md); margin-top: var(--spacing-2xl); }
h3 { font-size: 1.375rem; margin-bottom: var(--spacing-md); margin-top: var(--spacing-xl); }
h4 { font-size: 1.125rem; margin-bottom: var(--spacing-sm); margin-top: var(--spacing-lg); }

p {
  margin: 0 0 var(--spacing-md);
}

ul, ol {
  margin: 0 0 var(--spacing-md);
  padding-left: 1.5rem;
}

li {
  margin-bottom: var(--spacing-xs);
}

blockquote {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  border-left: 4px solid var(--color-accent);
  background: var(--color-white);
  color: var(--color-text-muted);
  font-style: italic;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-2xl) 0;
}

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

.site-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1;
  padding: var(--spacing-2xl) var(--spacing-md);
}

.content-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--spacing-2xl);
  align-items: start;
}

.content-wrapper--full {
  grid-template-columns: 1fr;
}

.content-area {
  min-width: 0;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-header-footer);
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--spacing-lg);
}

.site-branding {
  flex-shrink: 0;
}

.site-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
}

.site-title a {
  color: var(--color-white);
  text-decoration: none;
}

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

.site-description {
  margin: var(--spacing-xs) 0 0;
  font-size: 0.8125rem;
  color: #aaaaaa;
  max-width: 420px;
  line-height: 1.4;
}

/* Navigation */
.main-navigation {
  flex-shrink: 0;
}

.main-navigation ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.main-navigation li {
  margin: 0;
}

.main-navigation a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: #cccccc;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.main-navigation a:hover,
.main-navigation .current-menu-item > a,
.main-navigation .current_page_item > a {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid #555;
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9375rem;
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   Hero (home.php)
   ========================================================================== */

.hero-section {
  background: linear-gradient(135deg, var(--color-header-footer) 0%, #2a2a2a 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) var(--spacing-md);
  text-align: center;
}

.hero-section__inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero-section h1 {
  color: var(--color-white);
  font-size: 2.75rem;
  margin-bottom: var(--spacing-md);
}

.hero-section p {
  font-size: 1.1875rem;
  color: #cccccc;
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

.hero-section .btn {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition);
}

.hero-section .btn:hover {
  background: var(--color-accent-hover);
  color: var(--color-white);
  text-decoration: none;
}

/* ==========================================================================
   Post Cards (index / archive)
   ========================================================================== */

.posts-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.post-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}

.post-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.post-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.post-card__category {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  text-decoration: none;
}

.post-card__category:hover {
  background: var(--color-accent-hover);
  color: var(--color-white);
  text-decoration: none;
}

.post-card__title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.post-card__title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.post-card__excerpt {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
}

.read-more:hover {
  text-decoration: none;
}

.read-more::after {
  content: "→";
  transition: transform var(--transition);
}

.read-more:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   Single Post
   ========================================================================== */

.single-post {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.single-post__header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.single-post__title {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-md);
}

.single-post__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.single-post__meta a {
  text-decoration: none;
}

.single-post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.tag-link {
  display: inline-block;
  padding: 2px 10px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.tag-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

.single-post__content {
  max-width: var(--content-width);
}

.single-post__content > *:first-child {
  margin-top: 0;
}

/* Table of Contents */
.table-of-contents {
  background: var(--color-toc-bg);
  border: 1px solid var(--color-toc-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.table-of-contents__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 var(--spacing-md);
  color: var(--color-text);
}

.table-of-contents ol {
  margin: 0;
  padding-left: 1.25rem;
}

.table-of-contents li {
  margin-bottom: var(--spacing-sm);
  font-size: 0.9375rem;
}

.table-of-contents a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.table-of-contents a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ==========================================================================
   Page Template
   ========================================================================== */

.page-content {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.page-content__title {
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-md));
}

.widget {
  background: var(--color-sidebar-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.widget-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-light);
  margin: 0 0 var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-accent);
}

.widget ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.widget li {
  margin-bottom: 0;
  border-bottom: 1px solid var(--color-border);
}

.widget li:last-child {
  border-bottom: none;
}

.widget a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color var(--transition), padding-left var(--transition);
}

.widget a:hover {
  color: var(--color-accent);
  padding-left: var(--spacing-sm);
  text-decoration: none;
}

.widget .cat-item .count,
.widget .category-count {
  float: right;
  color: var(--color-text-light);
  font-size: 0.8125rem;
}

/* ==========================================================================
   Code Blocks
   ========================================================================== */

pre,
pre[class*="language-"] {
  background: var(--color-code-bg) !important;
  color: var(--color-code-text);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg) !important;
  margin: var(--spacing-lg) 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  box-shadow: var(--shadow-sm);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

:not(pre) > code {
  background: #eef2f7;
  color: #c7254e;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid #dde4ec;
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
  border: none;
  font-size: inherit;
}

.code-block-label {
  display: block;
  background: #2d2d2d;
  color: #aaaaaa;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border: 1px solid var(--color-code-border);
  border-bottom: none;
  margin-bottom: 0;
}

.code-block-label + pre {
  margin-top: 0 !important;
  border-radius: 0 0 var(--radius-md) var(--radius-md) !important;
}

/* Prism overrides */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #6a9955;
}

.token.punctuation {
  color: #d4d4d4;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol {
  color: #b5cea8;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin {
  color: #ce9178;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #d4d4d4;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #569cd6;
}

.token.function,
.token.class-name {
  color: #dcdcaa;
}

.token.regex,
.token.important,
.token.variable {
  color: #d16969;
}

/* ==========================================================================
   Tables
   ========================================================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  font-size: 0.9375rem;
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

thead {
  background: var(--color-header-footer);
  color: var(--color-white);
}

th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
}

td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:nth-child(even) {
  background: var(--color-bg);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--color-header-footer);
  color: #aaaaaa;
  padding: var(--spacing-2xl) var(--spacing-md);
  margin-top: auto;
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--spacing-xl);
}

.site-footer h3 {
  color: var(--color-white);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--spacing-md);
}

.site-footer p,
.site-footer li {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li {
  margin-bottom: var(--spacing-sm);
}

.site-footer a {
  color: #cccccc;
  text-decoration: none;
}

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

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.social-links a:hover {
  background: var(--color-accent);
}

.site-footer__bottom {
  max-width: var(--max-width);
  margin: var(--spacing-xl) auto 0;
  padding-top: var(--spacing-lg);
  border-top: 1px solid #333;
  text-align: center;
  font-size: 0.875rem;
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-2xl);
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  color: var(--color-text);
  font-size: 0.9375rem;
  text-decoration: none;
}

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

.pagination .current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.screen-reader-text {
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  width: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  word-wrap: normal !important;
}

.alignwide {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.alignfull {
  width: 100vw;
  max-width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
}

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

@media (max-width: 1024px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }

  .site-header__inner {
    flex-wrap: wrap;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .site-description {
    display: none;
  }

  .menu-toggle {
    display: block;
    margin-left: auto;
  }

  .main-navigation {
    display: none;
    width: 100%;
    order: 3;
  }

  .main-navigation.is-open {
    display: block;
  }

  .main-navigation ul {
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-sm) 0;
  }

  .main-navigation a {
    padding: var(--spacing-sm) 0;
  }

  .hero-section h1 {
    font-size: 2rem;
  }

  .single-post,
  .page-content,
  .post-card {
    padding: var(--spacing-lg);
  }

  .single-post__title {
    font-size: 1.75rem;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  body {
    font-size: 1rem;
  }

  .site-main {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  pre,
  pre[class*="language-"] {
    font-size: 0.8125rem;
    padding: var(--spacing-md) !important;
  }
}

/* Smooth scroll offset for sticky header */
:target { scroll-margin-top: calc(var(--header-height) + 1rem); }
.site-logo img { max-height: 48px; width: auto; }