/* ==========================================================================
   Mayank Thakur - Portfolio & Blog
   Clean, typography-focused design
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Variables)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Light Mode */
  --color-bg: #fafafa;
  --color-bg-secondary: #f0f0f0;
  --color-text: #1a1a1a;
  --color-text-secondary: #555;
  --color-text-muted: #777;
  --color-link: #1a1a1a;
  --color-link-hover: #0066cc;
  --color-border: #e0e0e0;
  --color-code-bg: #f5f5f5;
  --color-accent: #0066cc;

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --font-size-base: 18px;
  --font-size-small: 0.875rem;
  --font-size-smaller: 0.8125rem;
  --font-size-h1: 2rem;
  --font-size-h2: 1.5rem;
  --font-size-h3: 1.25rem;
  
  --line-height: 1.65;
  --line-height-heading: 1.3;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 4rem;
  
  /* Layout */
  --max-width: 65ch;
  --max-width-wide: 80ch;
}

/* Dark Mode - System Preference (fallback) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1a1a1a;
    --color-bg-secondary: #252525;
    --color-text: #e8e8e8;
    --color-text-secondary: #b0b0b0;
    --color-text-muted: #888;
    --color-link: #e8e8e8;
    --color-link-hover: #6ab0f3;
    --color-border: #333;
    --color-code-bg: #2d2d2d;
    --color-accent: #6ab0f3;
  }
}

/* Dark Mode - Manual Override */
:root[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-bg-secondary: #252525;
  --color-text: #e8e8e8;
  --color-text-secondary: #b0b0b0;
  --color-text-muted: #888;
  --color-link: #e8e8e8;
  --color-link-hover: #6ab0f3;
  --color-border: #333;
  --color-code-bg: #2d2d2d;
  --color-accent: #6ab0f3;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent);
  color: white;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  font-weight: 600;
  line-height: var(--line-height-heading);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

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

strong, b {
  font-weight: 600;
}

blockquote {
  margin: var(--space-lg) 0;
  padding-left: var(--space-md);
  border-left: 3px solid var(--color-border);
  color: var(--color-text-secondary);
  font-style: italic;
}

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

/* Lists */
ul, ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-lg);
}

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

li > ul, li > ol {
  margin-top: var(--space-xs);
  margin-bottom: 0;
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.3em;
  background-color: var(--color-code-bg);
  border-radius: 3px;
}

pre {
  margin: var(--space-lg) 0;
  padding: var(--space-md);
  overflow-x: auto;
  background-color: var(--color-code-bg);
  border-radius: 6px;
  line-height: 1.5;
}

pre code {
  padding: 0;
  background: none;
  font-size: var(--font-size-small);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--space-lg) 0;
  border-radius: 4px;
}

figure {
  margin: var(--space-lg) 0;
}

figcaption {
  margin-top: var(--space-sm);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  text-align: center;
}

/* Tables */
table {
  width: 100%;
  margin: var(--space-lg) 0;
  border-collapse: collapse;
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.site-header {
  padding: var(--space-lg) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.nav-home {
  font-weight: 600;
  text-decoration: none;
  font-size: 1.125rem;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-secondary);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}

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

/* Show sun icon in dark mode, moon icon in light mode */
.theme-toggle .sun-icon {
  display: none;
}

.theme-toggle .moon-icon {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

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

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

.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
  min-height: 60vh;
}

.site-footer {
  padding: var(--space-xl) var(--space-md);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xxl);
}

.footer-content {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-small);
}

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

.footer-meta {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.footer-meta a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-smaller);
}

.footer-copyright {
  color: var(--color-text-muted);
  font-size: var(--font-size-smaller);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Homepage
   -------------------------------------------------------------------------- */
.home-intro {
  margin-bottom: var(--space-xxl);
}

.home-intro h1 {
  margin-top: 0;
  font-size: var(--font-size-h1);
}

.home-intro .tagline {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-sm);
}

.section-header h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
}

.section-header a {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Post List
   -------------------------------------------------------------------------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.post-list-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.post-list-category {
  text-transform: capitalize;
}

.post-list-title {
  margin: 0 0 var(--space-xs) 0;
  font-size: 1.125rem;
  font-weight: 600;
}

.post-list-title a {
  text-decoration: none;
}

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

.post-list-excerpt {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

.post-list-empty {
  color: var(--color-text-muted);
  font-style: italic;
}

/* --------------------------------------------------------------------------
   Blog Page
   -------------------------------------------------------------------------- */
.blog-header {
  margin-bottom: var(--space-xl);
}

.blog-header h1 {
  margin-top: 0;
}

.category-nav {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.category-nav a {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-small);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.category-nav a:hover,
.category-nav a[aria-current="page"] {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Single Post
   -------------------------------------------------------------------------- */
.post-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.post-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

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

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

.post-title {
  margin: 0 0 var(--space-sm) 0;
  font-size: 2rem;
  line-height: 1.2;
}

.post-description {
  margin: 0;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.post-content {
  margin-bottom: var(--space-xl);
}

.post-content h2 {
  margin-top: var(--space-xxl);
}

.post-content h2:first-child {
  margin-top: 0;
}

/* Anchor links in headings */
.post-content h2 a,
.post-content h3 a {
  text-decoration: none;
  color: inherit;
}

.post-content h2 a:hover::before,
.post-content h3 a:hover::before {
  content: "#";
  margin-right: var(--space-xs);
  color: var(--color-text-muted);
}

.post-footer {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.post-tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.tag {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  text-decoration: none;
}

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

/* Post Navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.post-nav-link {
  text-decoration: none;
}

.post-nav-next {
  text-align: right;
}

.post-nav-label {
  display: block;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.post-nav-title {
  color: var(--color-text);
  font-weight: 500;
}

.post-nav-link:hover .post-nav-title {
  color: var(--color-link-hover);
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about-header {
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
  margin-bottom: var(--space-xl);
}

.about-photo {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.about-intro h1 {
  margin-top: 0;
}

.social-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.social-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-small);
}

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

@media (max-width: 600px) {
  .about-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .social-links {
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   Projects Page
   -------------------------------------------------------------------------- */
.project-list {
  display: grid;
  gap: var(--space-xl);
}

.project-item {
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.project-item:last-child {
  border-bottom: none;
}

.project-item h3 {
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.project-item h3 a {
  text-decoration: none;
}

.project-item p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.project-tech {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.project-tech span {
  font-size: var(--font-size-smaller);
  color: var(--color-text-muted);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-secondary);
  border-radius: 4px;
}

/* --------------------------------------------------------------------------
   Syntax Highlighting (Prism.js - Tomorrow Night inspired)
   -------------------------------------------------------------------------- */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #8292a2;
}

.token.punctuation {
  color: #c5c8c6;
}

.token.namespace {
  opacity: 0.7;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #cc6666;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #b5bd68;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #8abeb7;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #b294bb;
}

.token.function,
.token.class-name {
  color: #81a2be;
}

.token.regex,
.token.important,
.token.variable {
  color: #de935f;
}

.token.important,
.token.bold {
  font-weight: bold;
}

.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}

/* Light mode adjustments for code */
@media (prefers-color-scheme: light) {
  .token.comment,
  .token.prolog,
  .token.doctype,
  .token.cdata {
    color: #6a737d;
  }

  .token.punctuation {
    color: #24292e;
  }

  .token.property,
  .token.tag,
  .token.boolean,
  .token.number,
  .token.constant,
  .token.symbol,
  .token.deleted {
    color: #d73a49;
  }

  .token.selector,
  .token.attr-name,
  .token.string,
  .token.char,
  .token.builtin,
  .token.inserted {
    color: #22863a;
  }

  .token.operator,
  .token.entity,
  .token.url,
  .language-css .token.string,
  .style .token.string {
    color: #005cc5;
  }

  .token.atrule,
  .token.attr-value,
  .token.keyword {
    color: #6f42c1;
  }

  .token.function,
  .token.class-name {
    color: #005cc5;
  }

  .token.regex,
  .token.important,
  .token.variable {
    color: #e36209;
  }
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.prose > *:first-child {
  margin-top: 0;
}

.prose > *:last-child {
  margin-bottom: 0;
}

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

.text-small {
  font-size: var(--font-size-small);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 600px) {
  :root {
    --font-size-base: 17px;
    --font-size-h1: 1.75rem;
    --font-size-h2: 1.375rem;
    --font-size-h3: 1.125rem;
  }
  
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: var(--space-sm);
  }
  
  .post-nav {
    grid-template-columns: 1fr;
  }
  
  .post-nav-next {
    text-align: left;
  }
}

/* --------------------------------------------------------------------------
   Embeds (Strava, YouTube, etc.)
   -------------------------------------------------------------------------- */
.strava-embed-container,
.video-embed-container {
  margin: var(--space-lg) 0;
  border-radius: 6px;
  overflow: hidden;
}

.strava-embed-container iframe,
.video-embed-container iframe {
  display: block;
  border: none;
}

/* Race info box */
.race-info {
  background: var(--color-bg-secondary);
  border-radius: 6px;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
}

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

.race-info li {
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.race-info strong {
  display: inline-block;
  min-width: 120px;
}