/* onoht Shared Style System
 * Apply to all repos for consistent branding
 * Include dark/light toggle + responsive
 */

/* Font */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Light Theme (default) */
  --bg: #ffffff;
  --text: #000000;
  --muted: #666666;
  --border: #e0e0e0;

  /* Light mode accents - Terracotta/Burnt Sienna */
  --accent: #B85C38;
  --accent-hover: #9A4A2A;
  --accent-subtle: rgba(184, 92, 56, 0.1);

  /* Typography */
  --font: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 28px;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-xxl: 64px;

  /* Layout */
  --max-width: 640px;
  --line-height: 1.6;
}

[data-theme="dark"] {
  --bg: #000000;
  --text: #ffffff;
  --muted: #999999;
  --border: #222222;

  /* Dark mode accents - Warm Amber */
  --accent: #E8A838;
  --accent-hover: #F0BA50;
  --accent-subtle: rgba(232, 168, 56, 0.1);
}

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

/* Base */
html {
  font-size: var(--text-base);
}

body {
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: var(--line-height);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.4s ease-out, color 0.4s ease-out, border-color 0.4s ease-out;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  line-height: 1.3;
}

h1 { font-size: var(--text-xl); }
h2 { font-size: var(--text-lg); }
h3 { font-size: var(--text-base); }

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

a {
  color: var(--text);
  text-decoration: none;
  position: relative;
}

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

/* Focus states for keyboard navigation */
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}

/* Animated underline for content links */
a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s ease-out, left 0.25s ease-out;
}

a:hover::after {
  width: 100%;
  left: 0;
}

/* No underline animation for nav, logo, and special links */
.logo a::after,
nav a::after,
.post-title a::after,
article h2 a::after,
.archive-list a::after,
.back-link::after,
.further-reading a::after {
  display: none;
}

/* Header */
header {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  font-size: var(--text-lg);
  font-weight: 400;
}

.logo a {
  text-decoration: none;
  transition: color 0.3s ease-out;
}

.logo a:hover {
  background: none;
  color: var(--accent);
}

nav {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

nav a:hover {
  background: none;
  border-bottom-color: var(--text);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--text-sm);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  transition: transform 0.2s ease-out, background 0.3s ease-out, color 0.3s ease-out, border-color 0.3s ease-out;
}

.theme-toggle:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  transform: scale(1.05);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* Main Content */
main {
  padding: var(--space-xl) 0;
  min-height: calc(100vh - 200px);
}

/* Footer */
footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--muted);
}

footer .symbol {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
  color: var(--accent);
  transition: color 0.3s ease-out, transform 0.3s ease-out;
  cursor: default;
}

footer .symbol:hover {
  transform: scale(1.1);
}

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

.post-list li {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border);
}

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

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

.post-title {
  font-size: var(--text-lg);
}

.post-title a {
  text-decoration: none;
  border-bottom: 1px solid var(--text);
  transition: color 0.3s ease-out, border-color 0.3s ease-out;
}

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

/* Post Single */
.post-header {
  margin-bottom: var(--space-xl);
}

.post-meta {
  font-size: var(--text-sm);
  color: var(--muted);
  margin-top: var(--space-sm);
}

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

.post-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

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

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

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

.post-content pre, .post-content code {
  font-family: var(--font);
  font-size: var(--text-sm);
}

.post-content pre {
  background: var(--text);
  color: var(--bg);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.post-content code {
  background: var(--border);
  padding: 2px 6px;
}

.post-content pre code {
  background: none;
  padding: 0;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
  color: var(--muted);
  background: var(--accent-subtle);
  padding: var(--space-sm) var(--space-md);
  border-radius: 0 4px 4px 0;
}

/* Back Link */
.back-link {
  display: inline-block;
  margin-top: var(--space-xl);
  font-size: var(--text-sm);
  text-decoration: none;
  color: var(--muted);
  transition: color 0.3s ease-out;
}

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

/* Responsive */
@media (max-width: 680px) {
  :root {
    --text-base: 14px;
    --space-xl: 32px;
    --space-xxl: 48px;
  }

  header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  nav {
    width: 100%;
  }
}

/* Posts Section */
.posts-section {
  margin-bottom: var(--space-xxl);
}

.posts-section h2 {
  margin-bottom: var(--space-xs);
}

.posts-section .section-intro {
  color: var(--muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-lg);
}

/* Post Tag */
.post-tag {
  display: block;
  font-size: var(--text-xs);
  color: var(--muted);
  margin-top: var(--space-xs);
}

/* Explorations-specific styles */
.tagline {
  font-size: var(--text-sm);
  color: var(--muted);
  margin-top: var(--space-xs);
}

.intro {
  font-size: var(--text-base);
  margin-bottom: var(--space-sm);
}

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

.topic {
  text-transform: lowercase;
}

.coming-soon {
  margin-top: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.coming-soon h3 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.coming-soon ul {
  list-style: none;
  padding: 0;
}

.coming-soon li {
  padding: var(--space-xs) 0;
  color: var(--muted);
}

/* Post page styles */
.post h1 {
  margin-bottom: var(--space-xs);
}

.post .date {
  font-size: var(--text-sm);
  color: var(--muted);
  margin-bottom: var(--space-xl);
}

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

.post ul, .post ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

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

.post pre {
  background: var(--text);
  color: var(--bg);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
  font-size: var(--text-sm);
}

.post code {
  font-size: var(--text-sm);
}

.post pre code {
  background: none;
  padding: 0;
}

/* Demo boxes */
.demo {
  border: 1px solid var(--border);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  transition: border-color 0.3s ease-out, box-shadow 0.3s ease-out;
}

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

.demo-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.demo pre {
  margin: var(--space-sm) 0;
}

.interactive-hint {
  font-size: var(--text-xs);
  color: var(--muted);
  margin-top: var(--space-md);
  font-style: italic;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: var(--text-sm);
}

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

th {
  font-weight: 500;
}

/* Further reading */
.further-reading {
  font-size: var(--text-sm);
  color: var(--muted);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

.further-reading a {
  color: var(--accent);
}

/* Archive list */
.archive-list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-lg);
}

.archive-list li {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border);
}

.archive-list li:last-child {
  border-bottom: none;
}

.archive-list time {
  font-size: var(--text-xs);
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--muted);
}

.archive-list a {
  font-size: var(--text-base);
  text-decoration: none;
  border-bottom: 1px solid var(--text);
  transition: color 0.3s ease-out, border-color 0.3s ease-out;
}

.archive-list a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.archive-list .meta {
  font-size: var(--text-xs);
  margin-top: var(--space-xs);
  color: var(--muted);
}

.archive-year {
  margin-top: var(--space-xl);
}

.archive-month {
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
}

/* Article cards on index */
article {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border);
}

article:last-of-type {
  border-bottom: none;
}

article time {
  font-size: var(--text-sm);
  color: var(--muted);
  display: block;
  margin-bottom: var(--space-xs);
}

article h2 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
}

article h2 a {
  text-decoration: none;
  border-bottom: 1px solid var(--text);
  transition: color 0.3s ease-out, border-color 0.3s ease-out;
}

article h2 a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Canvas and button styling for demos */
canvas {
  max-width: 100%;
  height: auto;
}

button {
  font-family: var(--font);
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

input[type="number"] {
  font-family: var(--font);
  padding: var(--space-xs);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  width: 60px;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--text);
}

input[type="number"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

label {
  cursor: pointer;
}

/* ========================================
   ANIMATIONS - Refined, quiet confidence
   ======================================== */

/* Keyframes */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInSubtle {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Entrance animations */
header {
  animation: fadeInSubtle 0.5s ease-out;
}

main {
  animation: fadeIn 0.6s ease-out;
}

footer {
  animation: fadeInSubtle 0.5s ease-out 0.1s both;
}

/* Staggered fade-in for post list items */
.post-list li {
  opacity: 0;
  animation: fadeIn 0.5s ease-out forwards;
}

.post-list li:nth-child(1) { animation-delay: 0.1s; }
.post-list li:nth-child(2) { animation-delay: 0.2s; }
.post-list li:nth-child(3) { animation-delay: 0.3s; }
.post-list li:nth-child(4) { animation-delay: 0.4s; }
.post-list li:nth-child(5) { animation-delay: 0.5s; }
.post-list li:nth-child(6) { animation-delay: 0.6s; }
.post-list li:nth-child(7) { animation-delay: 0.7s; }
.post-list li:nth-child(8) { animation-delay: 0.8s; }

/* Article cards on index - staggered */
article {
  opacity: 0;
  animation: fadeIn 0.5s ease-out forwards;
}

article:nth-of-type(1) { animation-delay: 0.1s; }
article:nth-of-type(2) { animation-delay: 0.2s; }
article:nth-of-type(3) { animation-delay: 0.3s; }
article:nth-of-type(4) { animation-delay: 0.4s; }
article:nth-of-type(5) { animation-delay: 0.5s; }

/* Post header animation */
.post-header {
  animation: fadeIn 0.5s ease-out;
}

/* Post content staggered sections */
.post-content > * {
  animation: fadeInSubtle 0.4s ease-out;
}

/* Scroll reveal targets (activated via JS) */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   MICRO-INTERACTIONS
   ======================================== */

/* Article cards: subtle lift on hover */
.post-list li,
article {
  transition: transform 0.25s ease-out, box-shadow 0.25s ease-out;
  border-radius: 2px;
}

.post-list li:hover,
article:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .post-list li:hover,
[data-theme="dark"] article:hover {
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.04);
}

/* ========================================
   REDUCED MOTION
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  /* Disable all entrance animations */
  header,
  main,
  footer,
  .post-list li,
  article,
  .post-header,
  .post-content > * {
    animation: none;
    opacity: 1;
    transform: none;
  }

  /* Simplify micro-interactions */
  a::after {
    transition: none;
  }

  .post-list li:hover,
  article:hover {
    transform: none;
    box-shadow: none;
  }

  .theme-toggle {
    transition: background 0.2s ease-out, color 0.2s ease-out;
  }

  .theme-toggle:hover {
    transform: none;
  }

  .demo {
    transition: none;
  }

  .demo:hover {
    box-shadow: none;
  }

  /* Scroll reveal: instant */
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Utility */
.muted {
  color: var(--muted);
}

.text-center {
  text-align: center;
}

.mt-xl {
  margin-top: var(--space-xl);
}

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