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

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  background-color: var(--color-bg);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-title {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.site-title:visited {
  color: var(--color-text);
}

.site-logo {
  width: var(--space-5);
  height: var(--space-5);
  flex-shrink: 0;
}

nav[aria-label="Main navigation"] {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

/* Mobile nav toggle */
.nav-menu-toggle { display: none; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

@media (max-width: 39.999rem) {
  .site-header { position: relative; }

  .nav-menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    padding: var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: transparent;
    color: var(--color-text);
    cursor: pointer;
    transition: color var(--duration-fast) ease,
                border-color var(--duration-fast) ease;
    flex-shrink: 0;
  }

  .nav-menu-toggle:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
  }

  .nav-menu-toggle:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }

  .nav-menu-toggle .icon-close { display: none; }
  .nav-menu-toggle[aria-expanded="true"] .icon-menu { display: none; }
  .nav-menu-toggle[aria-expanded="true"] .icon-close { display: block; }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-4);
    z-index: 50;
  }

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

  .nav-menu nav[aria-label="Main navigation"] {
    flex-direction: column;
    gap: var(--space-1);
  }
}

.nav-link {
  font-size: var(--text-base);
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  transition: color var(--duration-fast) ease,
              background-color var(--duration-fast) ease;
}

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

.nav-link:visited {
  color: var(--color-text);
}

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

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 700;
}

/* ==========================================================================
   Post Card
   ========================================================================== */

.post-card {
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

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

.post-card h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.post-card h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card h2 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.post-card h2 a:visited {
  color: var(--color-text);
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-3);
}

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

.post-card p {
  color: var(--color-text);
  margin-top: var(--space-3);
  margin-bottom: 0;
}

/* ==========================================================================
   Tags
   ========================================================================== */

.tag {
  display: inline-block;
  font-size: var(--text-sm);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  text-decoration: none;
  transition: background-color var(--duration-fast) ease,
              color var(--duration-fast) ease;
  line-height: 1.4;
}

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

.tag:visited {
  color: var(--color-accent);
}

.tag:visited:hover {
  color: var(--color-accent);
  background-color: var(--color-surface);
}

.tag--active {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.tag--active:hover {
  background-color: var(--color-accent-hover);
  color: #fff;
  text-decoration: none;
}

.tag--active:visited {
  color: #fff;
}

.tag--active:visited:hover {
  background-color: var(--color-accent-hover);
  color: #fff;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

/* ==========================================================================
   Project Card
   ========================================================================== */

.project-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
  background-color: var(--color-bg);
}

.project-card h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.project-card p {
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

/* Project metadata (GitHub enrichment) */
.project-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.project-language {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  line-height: 1.4;
}

.project-stat {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.project-stat svg {
  flex-shrink: 0;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: var(--text-base);
  font-family: var(--font-body);
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-fast) ease,
              color var(--duration-fast) ease,
              border-color var(--duration-fast) ease;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.4;
}

.btn:hover {
  text-decoration: none;
}

.btn--outline {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: transparent;
}

.btn--outline:hover {
  background-color: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

.btn--outline:visited {
  color: var(--color-accent);
}

.btn--outline:visited:hover {
  color: #fff;
}

.load-more {
  display: flex;
  justify-content: center;
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
}

/* ==========================================================================
   Theme Toggle Button
   ========================================================================== */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: color var(--duration-fast) ease,
              border-color var(--duration-fast) ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* ==========================================================================
   HTMX Indicator
   ========================================================================== */

.htmx-indicator {
  opacity: 0;
  transition: opacity var(--duration-normal) ease;
}

.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
  opacity: 1;
}

/* ==========================================================================
   Table of Contents
   ========================================================================== */

.post-toc {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  border-left: 3px solid var(--color-accent);
  background-color: var(--color-surface);
  border-radius: var(--radius);
}

.post-toc h2 {
  font-size: var(--text-base);
  margin-bottom: var(--space-3);
}

.post-toc ol {
  list-style: none;
  padding-left: 0;
}

.post-toc li {
  margin-bottom: var(--space-1);
}

.post-toc a {
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
}

.post-toc a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.post-toc a.toc-active {
  color: var(--color-accent);
  font-weight: 700;
}

.post-toc a:visited {
  color: var(--color-text);
}

.toc-level-3 { padding-left: var(--space-4); }
.toc-level-4 { padding-left: var(--space-6); }
.toc-level-5 { padding-left: calc(var(--space-6) + var(--space-2)); }
.toc-level-6 { padding-left: calc(var(--space-6) + var(--space-4)); }

/* ==========================================================================
   Search
   ========================================================================== */

.search-page {
  max-width: var(--prose-width);
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-family: var(--font-body);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.search-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-color: var(--color-accent);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

/* ==========================================================================
   Search Dialog (Svelte Island)
   ========================================================================== */

.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: var(--text-sm);
  font-family: var(--font-body);
  transition: color var(--duration-fast) ease,
              border-color var(--duration-fast) ease;
}

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

.search-trigger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.search-shortcut kbd {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.nav-search {
  display: inline-flex;
}

.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
}

.search-dialog {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  width: 100%;
  max-width: 36rem;
  max-height: 60vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  margin-left: var(--space-3);
  margin-right: var(--space-3);
}

.search-dialog-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.search-dialog-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: var(--text-base);
  font-family: var(--font-body);
  color: var(--color-text);
  outline: none;
  padding: var(--space-1) 0;
}

.search-dialog-input::placeholder {
  color: var(--color-text-muted);
}

.search-dialog-close {
  border: none;
  background: transparent;
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border-radius: var(--radius);
  transition: color var(--duration-fast) ease;
}

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

.search-dialog-close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.search-dialog-results {
  overflow-y: auto;
  padding: var(--space-3) var(--space-4);
}

.search-dialog-results .post-card {
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

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

.search-dialog-results .post-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.search-dialog-status {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-align: center;
  padding: var(--space-4) 0;
  margin: 0;
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
  margin-top: var(--space-7);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-align: center;
}

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

.site-footer a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

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