/* ==========================================================================
   1. CSS Variables & Design Tokens
   ========================================================================== */
:root {
  /* Dark Theme (Default) */
  --bg: #0d1117;
  --card-bg: #161b22;
  --text: #c9d1d9;
  --text-heading: #f0f6fc;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --border: #30363d;
  --header-bg: rgba(13, 17, 23, 0.85);
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

[data-theme="light"] {
  /* Toasted Latte Light Theme (Darker & Warmer) */
  --bg: #e6dccf;             /* Rich, warm toasted latte base (less glare) */
  --card-bg: #d9ccbc;        /* Deeper coffee-cream surface */
  --text: #2c251f;           /* Deep espresso body text */
  --text-heading: #120e0b;   /* Near-black dark roast heading */
  --text-muted: #625547;     /* Warm roasted hazelnut grey */
  --accent: #8c3b00;         /* Deep amber / burnt caramel accent */
  --border: #caa385;         /* Defined warm mocha border */
  --header-bg: rgba(230, 220, 207, 0.88);
}

/* ==========================================================================
   2. Global Layout & Resets
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0 1.25rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.container, main {
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

.container {
  padding-bottom: 2.5rem;
}

/* ==========================================================================
   3. Sticky Glassmorphism Header & Theme Toggle
   ========================================================================== */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  margin-bottom: 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  transition: padding 0.2s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo {
  display: block;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.brand-logo-link:hover .brand-logo {
  transform: rotate(-5deg) scale(1.05);
}

header.site-header .brand h1 {
  margin: 0;
  font-size: 1.4rem;
  line-height: 1.2;
}

header.site-header .brand h1 a {
  color: var(--text-heading);
  text-decoration: none;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.5px;
}

header.site-header .brand p {
  color: var(--text-muted);
  margin: 0.3rem 0 0 0;
  font-size: 0.88rem;
}

/* Theme Toggle Switch */
.theme-toggle {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.45rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Toggle Sun/Moon Icon visibility */
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: block;
}

:root:not([data-theme="light"]) .sun-icon {
  display: block;
}
:root:not([data-theme="light"]) .moon-icon {
  display: none;
}

/* ==========================================================================
   4. Post Cards
   ========================================================================== */
.post-card {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.post-card:last-child {
  border-bottom: none;
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.post-title {
  margin: 0 0 0.6rem 0;
  font-size: 1.45rem;
  line-height: 1.3;
}

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

.post-title a:hover {
  text-decoration: underline;
}

.post-desc {
  color: var(--text);
  margin: 0;
  font-size: 1rem;
}

.post-card.pinned {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
}

.pinned-badge {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}

a.tag {
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  display: inline-block;
}

a.tag:hover {
  background: var(--border);
  color: var(--text-heading);
  border-color: var(--accent);
}

.back-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 2rem;
}

.back-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   5. GitHub Flavored Markdown (GFM) Overrides
   ========================================================================== */
.markdown-body {
  background-color: transparent !important;
  color: var(--text) !important;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--text-heading) !important;
  border-bottom-color: var(--border) !important;
}

.markdown-body a {
  color: var(--accent) !important;
}

.markdown-body blockquote {
  color: var(--text-muted) !important;
  border-left-color: var(--accent) !important;
}

.markdown-body pre,
.markdown-body table {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.markdown-body pre {
  background-color: var(--card-bg) !important;
  border: 1px solid var(--border) !important;
  border-radius: 6px !important;
}

.markdown-body code:not(pre code) {
  background-color: var(--card-bg) !important;
  color: var(--accent) !important;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2em 0.4em;
}

/* ==========================================================================
   6. Images & Figures
   ========================================================================== */
.markdown-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.75rem auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.markdown-body img + em,
.markdown-body figcaption {
  display: block;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: -1rem;
  margin-bottom: 1.75rem;
}

/* ==========================================================================
   7. Pagination & Footer
   ========================================================================== */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.pagination-btn {
  color: var(--accent);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--card-bg);
  transition: all 0.15s ease;
}

.pagination-btn:hover:not(.disabled) {
  border-color: var(--accent);
  background-color: var(--border);
}

.pagination-btn.disabled {
  color: var(--text-muted);
  border-color: transparent;
  background-color: transparent;
  cursor: not-allowed;
  opacity: 0.4;
}

.pagination-info {
  color: var(--text-muted);
}

footer.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding-top: 2rem;
  padding-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

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

/* ==========================================================================
   8. Responsive Breakpoints
   ========================================================================== */
@media (max-width: 768px) {
  header.site-header {
    padding: 0.85rem 0;
    margin-bottom: 1.75rem;
  }

  header.site-header .brand h1 {
    font-size: 1.25rem;
  }

  header.site-header .brand p {
    font-size: 0.82rem;
  }
}

@media (max-width: 480px) {
  body {
    padding: 0 0.85rem;
  }

  header.site-header {
    padding: 0.75rem 0;
  }

  .brand-logo {
    width: 26px;
    height: 26px;
  }

  header.site-header .brand h1 {
    font-size: 1.1rem;
  }

  header.site-header .brand p {
    display: none;
  }

  .post-title {
    font-size: 1.25rem;
  }
}

/* ==========================================================================
   Categories Navigation Pills
   ========================================================================== */
.categories-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.category-pill {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.category-pill:hover,
.category-pill.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ==========================================================================
   Search Modal & Trigger
   ========================================================================== */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-trigger {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: all 0.2s ease;
}

.search-trigger:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.search-key {
  font-size: 0.7rem;
  background: var(--border);
  color: var(--text);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

/* Modal styling using native <dialog> */
.search-modal {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text);
  padding: 0;
  max-width: 580px;
  width: 90%;
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
}

.search-modal::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
}

.search-modal-content {
  padding: 1rem;
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
  color: var(--text-muted);
}

.search-input-wrapper input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-heading);
  font-size: 1.05rem;
  font-family: inherit;
}

.search-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.search-close:hover {
  color: var(--text-heading);
}

.search-results {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0 0;
  max-height: 320px;
  overflow-y: auto;
}

.search-result-item {
  display: block;
  padding: 0.75rem;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.15s ease;
}

.search-result-item:hover {
  background: var(--card-bg);
}

.result-title {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.result-desc {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 0.2rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.no-results {
  padding: 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}