/* ==========================================================================
   Adam Stack - Personal Blog Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Theme Variables)
   -------------------------------------------------------------------------- */

:root {
  /* Light Mode (default) */
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f5;
  --text-primary: #1a1a1a;
  --text-secondary: #525252;
  --text-muted: #737373;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: #ede9fe;
  --border: #e5e5e5;
  --border-light: #f0f0f0;
  --shadow: rgba(0, 0, 0, 0.05);
  --shadow-md: rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Sizing */
  --content-width: 680px;
  --site-width: 900px;
  --header-height: auto;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #171717;
  --bg-tertiary: #262626;
  --text-primary: #fafafa;
  --text-secondary: #a3a3a3;
  --text-muted: #737373;
  --accent: #a78bfa;
  --accent-hover: #c4b5fd;
  --accent-light: #1e1b4b;
  --border: #262626;
  --border-light: #1f1f1f;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-md: rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

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

.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--site-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-branding {
  flex: 1;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: inline-block;
}

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

.site-tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
  line-height: 1.5;
  max-width: 500px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* --------------------------------------------------------------------------
   Theme Toggle
   -------------------------------------------------------------------------- */

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.icon-sun,
.icon-moon {
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

/* Light mode: show moon, hide sun */
[data-theme="light"] .icon-sun {
  display: none;
}

[data-theme="light"] .icon-moon {
  display: block;
}

/* Dark mode: show sun, hide moon */
[data-theme="dark"] .icon-sun {
  display: block;
}

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

/* --------------------------------------------------------------------------
   Mobile Menu Toggle
   -------------------------------------------------------------------------- */

.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
}

.hamburger {
  width: 20px;
  height: 2px;
  background-color: currentColor;
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  left: 0;
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  top: 6px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
  transform: translateY(6px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.site-nav {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  overflow: visible;
}

/* Ensure nav is always visible on desktop */
@media (min-width: 769px) {
  .site-nav {
    display: block !important;
    max-height: none !important;
    overflow: visible !important;
  }
}

.nav-content {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md) var(--spacing-lg);
  align-items: flex-start;
}

.nav-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.nav-section:last-child {
  flex: 1;
}

.nav-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: var(--spacing-xs);
}

.nav-links a {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.tag-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  max-width: 100%;
}

/* Tag Pills */
.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--accent-light);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tag-pill:hover {
  background-color: var(--accent);
  color: white;
}

.tag-pill.tag-small {
  font-size: 0.75rem;
  padding: 0.125rem var(--spacing-sm);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .site-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .site-nav.is-open {
    max-height: 500px;
  }

  .nav-content {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-lg);
  }

  .nav-section {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }

  .nav-links,
  .tag-nav {
    flex-direction: column;
    width: 100%;
  }

  .nav-links a,
  .tag-pill {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    justify-content: flex-start;
  }
}

/* --------------------------------------------------------------------------
   Post Cards (List View)
   -------------------------------------------------------------------------- */

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

.post-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.post-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--shadow);
}

.post-card-header {
  margin-bottom: var(--spacing-sm);
}

.post-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.post-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}

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

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

.post-excerpt {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-top: var(--spacing-sm);
}

.post-card-footer {
  margin-top: var(--spacing-md);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

/* --------------------------------------------------------------------------
   Single Post
   -------------------------------------------------------------------------- */

.post-single {
  max-width: var(--content-width);
  margin: 0 auto;
}

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

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.post-title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

@media (min-width: 640px) {
  .post-title {
    font-size: 2.5rem;
  }
}

/* Post Content Typography */
.post-content {
  font-size: 1.0625rem;
  line-height: 1.75;
}

.post-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.post-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.post-content p {
  margin-bottom: var(--spacing-lg);
}

.post-content a {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 2px;
}

.post-content ul,
.post-content ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
}

.post-content ul {
  list-style-type: disc;
}

.post-content ol {
  list-style-type: decimal;
}

.post-content li {
  margin-bottom: var(--spacing-sm);
}

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

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--bg-tertiary);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
}

.post-content pre {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.post-content img {
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.post-content hr {
  border: none;
  height: 1px;
  background-color: var(--border);
  margin: var(--spacing-2xl) 0;
}

/* Post Footer */
.post-footer {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   Page Styles
   -------------------------------------------------------------------------- */

.page-single {
  max-width: var(--content-width);
  margin: 0 auto;
}

.page-header {
  margin-bottom: var(--spacing-xl);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-content {
  font-size: 1.0625rem;
  line-height: 1.75;
}

.page-content p {
  margin-bottom: var(--spacing-lg);
}

/* --------------------------------------------------------------------------
   Tag Archive
   -------------------------------------------------------------------------- */

.archive-header {
  margin-bottom: var(--spacing-xl);
}

.archive-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.archive-title .tag-pill {
  font-size: 1rem;
}

.archive-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.footer-content {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  text-align: center;
}

.footer-content p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 1.125rem;
}

/* --------------------------------------------------------------------------
   Responsive Adjustments
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
  }

  .site-tagline {
    font-size: 0.8125rem;
    padding-right: 100px;
  }

  .post-title {
    font-size: 1.75rem;
  }

  .post-content {
    font-size: 1rem;
  }
}