/* ===========================
   CSS VARIABLES
   =========================== */
:root {
  --bg-primary: #1c1c1e;
  --bg-card: #2a2a2c;
  --bg-input: #232325;
  /* --text-primary: #dcdcdc; */
  --text-primary: #f0f0f0;
  --text-secondary: #a0a0a0;
  --text-heading: #ececec;
  --accent: #7dcea0;
  --accent-hover: #6db88f;
  --accent-subtle: rgba(125, 206, 160, 0.1);
  --border: #3a3a3c;
  --border-hover: #4a4a4c;
  --radius: 8px;
  --header-height: 60px;
  --max-width: 1100px;
  --content-width: 860px;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: Georgia, 'Times New Roman', serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 18px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

/* ===========================
   HEADER
   =========================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}

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

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
}

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

/* ===========================
   MAIN CONTENT
   =========================== */
.main-content {
  flex: 1;
  margin-top: var(--header-height);
  padding: 48px 24px;
}

/* Single column layout (home, contact, individual posts) */
.content-single {
  max-width: var(--content-width);
  margin: 0 auto;
}

.content-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
}

.content-card h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 32px;
}

.content-card h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-top: 28px;
  margin-bottom: 12px;
}

.content-card p {
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.8;
}

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

.content-card a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.content-card a:hover {
  border-bottom-color: var(--accent);
}

/* ===========================
   POSTS PAGE - TWO COLUMN LAYOUT
   =========================== */
.content-posts {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 32px;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  align-self: start;
}

.sidebar-section {
  margin-bottom: 28px;
}

.sidebar-heading {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-heading);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

#searchBox {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s ease;
}

#searchBox::placeholder {
  color: var(--text-secondary);
}

#searchBox:focus {
  border-color: var(--accent);
}

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.tag-filter {
  padding: 5px 12px;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tag-filter:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.tag-filter.active {
  background-color: var(--accent-subtle);
  border-color: var(--border);
  color: var(--accent);
}

#clearFilters {
  margin-top: 12px;
  padding: 6px 14px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
}

#clearFilters:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#clearFilters.hidden {
  display: none;
}

/* Post list */
.page-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
}

.post-list-header {
  margin-bottom: 20px;
}

#resultsCount {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.post-card {
  display: block;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.15s ease;
}

.post-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.post-card h2 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.post-card:hover h2 {
  color: var(--accent);
}

.post-meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.post-excerpt {
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 14px;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 3px 10px;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===========================
   INDIVIDUAL POST PAGE
   =========================== */
.back-link {
  display: inline-block;
  margin-bottom: 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.post-header {
  margin-bottom: 28px;
}

.post-header h1 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
  line-height: 1.3;
}

.post-header .post-meta {
  margin-bottom: 14px;
}

.post-body {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.post-body h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-top: 36px;
  margin-bottom: 16px;
}

.post-body h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-top: 28px;
  margin-bottom: 12px;
}

.post-body p {
  margin-bottom: 18px;
  line-height: 1.8;
  color: var(--text-primary);
}

.post-body a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.post-body a:hover {
  border-bottom-color: var(--accent);
}

.post-body code {
  background-color: var(--bg-input);
  color: var(--accent);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--border);
}

.post-body pre {
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 20px;
}

.post-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.post-body ul,
.post-body ol {
  margin-bottom: 18px;
  padding-left: 24px;
}

.post-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.post-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* ===========================
   FOOTER
   =========================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.footer-copyright {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
  .content-posts {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    order: -1;
  }

  .content-card {
    padding: 32px;
  }

  .post-body {
    padding: 28px;
  }
}

@media (max-width: 500px) {
  .site-header {
    height: auto;
    padding: 12px 0;
  }

  .header-inner {
    flex-direction: column;
    gap: 10px;
    padding: 0 16px;
    align-items: center;
  }

  .main-content {
    margin-top: 100px;
  }

  html {
    scroll-padding-top: 120px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
  }

  .site-nav {
    gap: 16px;
  }

  .main-content {
    padding: 32px 16px;
  }

  .content-card {
    padding: 24px;
  }

  .content-card h1 {
    font-size: 1.6rem;
  }

  .post-header h1 {
    font-size: 1.6rem;
  }

  .post-body {
    padding: 20px;
  }

  .post-body h2 {
    font-size: 1.3rem;
  }
}