/*
 * Kubedo Academy - Main Stylesheet
 * Modern, accessible styles with dark/light mode support
 * Using Tailwind-inspired utility approach with CSS custom properties
 */

/* =========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================= */
:root {
  /* Colors - Light Mode */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  /* Brand Colors */
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-light: #eef2ff;
  --color-secondary: #0ea5e9;
  --color-accent: #8b5cf6;

  /* Status Colors */
  --color-success: #10b981;
  --color-success-bg: #d1fae5;
  --color-warning: #f59e0b;
  --color-warning-bg: #fef3c7;
  --color-error: #ef4444;
  --color-error-bg: #fee2e2;
  --color-info: #3b82f6;
  --color-info-bg: #dbeafe;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Borders */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --container-max: 100%;
  --sidebar-width: 280px;
  --toc-width: 240px;
  --header-height: 64px;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-text: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-border-strong: #475569;

  --color-primary-light: #312e81;
  --color-success-bg: #064e3b;
  --color-warning-bg: #78350f;
  --color-error-bg: #7f1d1d;
  --color-info-bg: #1e3a8a;
}

/* =========================================================================
   Base Styles
   ========================================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =========================================================================
   Typography
   ========================================================================= */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 var(--space-4);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

p {
  margin: 0 0 var(--space-4);
}

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

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* =========================================================================
   Layout
   ========================================================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.main-content {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* =========================================================================
   Header & Navigation
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.navbar {
  height: var(--header-height);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

.brand:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.brand-logo {
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
  text-decoration: none;
}

/* Dropdown Menu */
.nav-item.has-dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.dropdown-icon {
  transition: transform var(--transition-fast);
}

.nav-item.has-dropdown:hover .dropdown-icon,
.nav-item.has-dropdown.open .dropdown-icon {
  transform: rotate(180deg);
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  margin: 0;
  padding: var(--space-2);
  list-style: none;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown.open .dropdown-menu {
  display: block;
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.dropdown-link:hover {
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
  text-decoration: none;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.icon-sun {
  display: block;
}

.icon-moon {
  display: none;
}

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

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

/* Mobile Navigation */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
}

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

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  bottom: -7px;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: var(--space-4);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-list {
    flex-direction: column;
    width: 100%;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
  }
}

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer {
  padding: var(--space-12) 0 var(--space-8);
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
}

.footer-brand .brand-text {
  font-size: var(--text-xl);
  font-weight: 700;
}

.footer-tagline {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer-heading {
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

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

.footer-social {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

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

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* =========================================================================
   Content Layout
   ========================================================================= */
.content-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--toc-width);
  gap: var(--space-8);
}

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  height: fit-content;
  max-height: calc(100vh - var(--header-height) - var(--space-8));
  overflow-y: auto;
}

.content-main {
  min-width: 0;
}

.toc-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  height: fit-content;
  max-height: calc(100vh - var(--header-height) - var(--space-8));
  overflow-y: auto;
}

@media (max-width: 1200px) {
  .content-layout {
    grid-template-columns: var(--sidebar-width) 1fr;
  }

  .toc-sidebar {
    display: none;
  }
}

@media (max-width: 900px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }
}

/* =========================================================================
   Article Styles
   ========================================================================= */
.article-header {
  margin-bottom: var(--space-8);
}

.article-title {
  margin-bottom: var(--space-3);
  font-size: var(--text-4xl);
}

.article-description {
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

/* =========================================================================
   Prose Content
   ========================================================================= */
.prose {
  max-width: 75ch;
}

.prose h2 {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.prose h3 {
  margin-top: var(--space-8);
}

.prose h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.prose ul,
.prose ol {
  padding-left: var(--space-6);
}

.prose li {
  margin-bottom: var(--space-2);
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.prose blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-6);
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-bg-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

/* =========================================================================
   Code Blocks
   ========================================================================= */
.prose code {
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
}

.prose pre {
  margin: var(--space-6) 0;
  padding: var(--space-4);
  overflow-x: auto;
  background-color: #282a36;
  border-radius: var(--radius-lg);
}

.prose pre code {
  padding: 0;
  font-size: var(--text-sm);
  background: none;
  color: #f8f8f2;
}

/* =========================================================================
   Terminal Shortcode
   ========================================================================= */
.terminal {
  margin: var(--space-6) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: #1e1e1e;
  box-shadow: var(--shadow-lg);
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: #323232;
}

.terminal-buttons {
  display: flex;
  gap: var(--space-2);
}

.terminal-button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal-button.close {
  background-color: #ff5f56;
}

.terminal-button.minimize {
  background-color: #ffbd2e;
}

.terminal-button.maximize {
  background-color: #27ca40;
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: #888;
}

.terminal-copy {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: none;
  border: none;
  color: #888;
  font-size: var(--text-xs);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.terminal-copy:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.1);
}

.copy-feedback {
  display: none;
}

.terminal-copy.copied .copy-feedback {
  display: inline;
}

.terminal-copy.copied svg {
  display: none;
}

.terminal-content {
  padding: var(--space-4);
}

.terminal-content pre {
  margin: 0;
  padding: 0;
  background: none;
}

.terminal-content code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: #4ade80;
}

/* =========================================================================
   Quiz Shortcode
   ========================================================================= */
.quiz-container {
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

.quiz-content strong {
  display: block;
  margin-bottom: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-text);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-2);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-option:hover {
  border-color: var(--color-primary);
}

.quiz-option.correct {
  background-color: var(--color-success-bg);
  border-color: var(--color-success);
}

.quiz-option.incorrect {
  background-color: var(--color-error-bg);
  border-color: var(--color-error);
}

.quiz-option.correct-answer {
  border-color: var(--color-success);
}

.quiz-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.quiz-results {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
}

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  color: #fff;
  background-color: var(--color-primary);
}

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

.btn-secondary {
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
}

.btn-secondary:hover {
  background-color: var(--color-border-strong);
  text-decoration: none;
}

.btn-ghost {
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background-color: var(--color-bg-secondary);
  text-decoration: none;
}

/* =========================================================================
   Breadcrumb
   ========================================================================= */
.breadcrumb {
  margin-bottom: var(--space-6);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.breadcrumb-link {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.breadcrumb-link:hover {
  color: var(--color-primary);
}

.breadcrumb-separator {
  color: var(--color-border-strong);
}

.breadcrumb-current {
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 500;
}

/* =========================================================================
   Table of Contents
   ========================================================================= */
.toc {
  margin-bottom: var(--space-8);
  padding: var(--space-4);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.toc-title {
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.toc nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.toc nav a {
  display: block;
  padding: var(--space-1) 0;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.toc nav a:hover {
  color: var(--color-primary);
}

.toc nav ul ul {
  padding-left: var(--space-4);
}

.toc-sidebar-title {
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* =========================================================================
   Article Navigation
   ========================================================================= */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.nav-prev,
.nav-next {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-prev:hover,
.nav-next:hover {
  background-color: var(--color-bg-tertiary);
  text-decoration: none;
}

.nav-next {
  justify-content: flex-end;
  text-align: right;
}

.nav-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-title {
  display: block;
  font-weight: 500;
}

/* =========================================================================
   Cards
   ========================================================================= */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.card-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  color: var(--color-text);
  text-decoration: none;
}

.card-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
}

.card-description {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.card-meta {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.card-arrow {
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.card:hover .card-arrow {
  transform: translateX(4px);
  color: var(--color-primary);
}

.list-items {
  display: grid;
  gap: var(--space-4);
}

/* =========================================================================
   Alerts (GitHub-style)
   ========================================================================= */
.prose blockquote:has([data-note]),
.prose blockquote:has([data-tip]),
.prose blockquote:has([data-important]),
.prose blockquote:has([data-warning]),
.prose blockquote:has([data-caution]) {
  padding-left: var(--space-4);
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* =========================================================================
   Search Modal
   ========================================================================= */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
}

.search-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.search-container {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 var(--space-4);
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.search-form {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
}

.search-input {
  flex: 1;
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-lg);
  border: none;
  background: none;
  color: var(--color-text);
  outline: none;
}

.search-close {
  padding: var(--space-4);
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
}

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

.search-results {
  max-height: 400px;
  overflow-y: auto;
}

/* =========================================================================
   Print Styles
   ========================================================================= */
@media print {

  .site-header,
  .sidebar,
  .toc-sidebar,
  .article-nav,
  .site-footer,
  .terminal-panel,
  .terminal-toggle {
    display: none;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .split-screen-container {
    display: block;
  }

  .content-panel {
    width: 100%;
  }

  body {
    color: #000;
    background: #fff;
  }
}

/* =========================================================================
   Split-Screen Layout (WASM Terminal)
   ========================================================================= */

.split-screen-container {
  display: grid;
  grid-template-columns: 60% 40%;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: fixed;
  top: 0;
  left: 0;
}

/* Collapsed terminal state - content takes full width */
.split-screen-container.terminal-collapsed {
  grid-template-columns: calc(100% - 48px) 48px;
}

/* Content Panel (Left Side) */
.content-panel {
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
}

.content-panel .site-header {
  position: sticky;
  top: 0;
  z-index: 100;
}

.content-panel .main-content,
.content-panel #swup {
  flex: 1;
  padding: var(--space-6);
  max-width: none;
}

.content-panel .site-footer {
  margin-top: auto;
}

/* Terminal Panel (Right Side) */
.terminal-panel {
  height: 100vh;
  background: #0f172a;
  /* Deep blue terminal background */
  border-left: 1px solid #1e293b;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: width 0.3s ease;
}

.terminal-panel.is-collapsed {
  width: 48px;
  overflow: hidden;
}

.terminal-panel.is-collapsed .terminal-content,
.terminal-panel.is-collapsed .terminal-quickbar,
.terminal-panel.is-collapsed .terminal-title,
.terminal-panel.is-collapsed .terminal-status {
  display: none;
}

/* Terminal Wrapper */
.terminal-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Terminal Header */
.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  background: #1e293b;
  border-bottom: 1px solid #334155;
  flex-shrink: 0;
}

.terminal-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: #94a3b8;
  font-size: var(--text-sm);
  font-family: var(--font-mono);
}

.terminal-icon {
  color: #22d3ee;
  /* Cyan accent */
}

.terminal-status {
  font-size: var(--text-xs);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: #334155;
  color: #94a3b8;
}

.terminal-status.is-ready {
  background: #064e3b;
  color: #34d399;
}

.terminal-status.is-error {
  background: #7f1d1d;
  color: #f87171;
}

/* Terminal Controls */
.terminal-controls {
  display: flex;
  gap: var(--space-1);
}

.terminal-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: #64748b;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.terminal-btn:hover {
  background: #334155;
  color: #f1f5f9;
}

/* Terminal Content */
.terminal-content {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.terminal-frame {
  width: 100%;
  height: 100%;
  border: none;
  background: #0f172a;
}

/* Loading Overlay */
.terminal-loading {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.95);
  color: #94a3b8;
  z-index: 10;
}

.terminal-loading p {
  margin: var(--space-2) 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.terminal-loading-hint {
  font-size: var(--text-xs);
  color: #64748b;
}

.terminal-loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid #334155;
  border-top-color: #22d3ee;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Terminal Display (CheerpX mount point) */
.terminal-display {
  width: 100%;
  height: 100%;
  background: #0f172a;
  font-family: var(--font-mono);
  font-size: 14px;
  color: #e2e8f0;
  overflow: auto;
}

.terminal-display canvas {
  width: 100% !important;
  height: 100% !important;
}

.terminal-frame {
  width: 100%;
  height: 100%;
  border: none;
  background: #0f172a;
}

/* Loading Progress Bar */
.terminal-loading-progress {
  width: 200px;
  height: 4px;
  background: #334155;
  border-radius: 2px;
  margin-top: var(--space-3);
  overflow: hidden;
}

.terminal-loading-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #22d3ee, #6366f1);
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* Error State */
.terminal-error {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.98);
  color: #f87171;
  gap: var(--space-3);
  z-index: 11;
}

.terminal-error p {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: #94a3b8;
}

.terminal-error-retry {
  padding: var(--space-2) var(--space-4);
  background: #6366f1;
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.terminal-error-retry:hover {
  background: #4f46e5;
  transform: translateY(-1px);
}


/* Quick Commands Bar */
.terminal-quickbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: #1e293b;
  border-top: 1px solid #334155;
  flex-shrink: 0;
  overflow-x: auto;
}

.terminal-quickbar-label {
  font-size: var(--text-xs);
  color: #64748b;
  flex-shrink: 0;
}

.terminal-quick-cmd {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 4px 8px;
  background: #334155;
  color: #e2e8f0;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.terminal-quick-cmd:hover {
  background: #475569;
  color: #22d3ee;
}

/* Terminal Expand Button (visible when collapsed) */
.terminal-expand-btn {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  border: none;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  box-shadow: -4px 0 20px rgba(99, 102, 241, 0.4);
  z-index: 100;
  transition: all var(--transition-base);
}

.terminal-expand-btn:hover {
  padding-right: var(--space-6);
  box-shadow: -6px 0 25px rgba(99, 102, 241, 0.6);
}

.terminal-expand-btn svg {
  flex-shrink: 0;
}

/* Hide expand button when terminal is open */
.split-screen-container:not(.terminal-collapsed)~.terminal-expand-btn {
  display: none;
}

/* Terminal Toggle Button (Mobile) */
.terminal-toggle {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: none;
  color: white;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
  cursor: pointer;
  z-index: 1000;
  transition: all var(--transition-base);
}

.terminal-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 25px rgba(99, 102, 241, 0.5);
}

.terminal-toggle.is-active {
  background: linear-gradient(135deg, #22d3ee, #0ea5e9);
}

.terminal-toggle-icon {
  width: 24px;
  height: 24px;
}

/* Terminal Toast */
.terminal-toast {
  position: fixed;
  bottom: 90px;
  right: 20px;
  padding: var(--space-3) var(--space-4);
  background: #1e293b;
  color: #f1f5f9;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-base);
  z-index: 1001;
  pointer-events: none;
}

.terminal-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================================
   Swup Transitions
   ========================================================================= */

.swup-transition-main {
  transition: opacity 0.2s ease, transform 0.2s ease;
}

html.is-animating .swup-transition-main {
  opacity: 0;
  transform: translateY(8px);
}

html.is-leaving .swup-transition-main {
  opacity: 0;
  transform: translateY(-8px);
}

/* Loading state */
body.is-loading {
  cursor: wait;
}

/* =========================================================================
   Split-Screen Responsive Design
   ========================================================================= */

@media (max-width: 1024px) {
  .split-screen-container {
    grid-template-columns: 1fr;
    position: relative;
    height: auto;
    min-height: 100vh;
  }

  .content-panel {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .terminal-panel {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 500px;
    z-index: 999;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .terminal-panel.is-visible {
    display: flex;
    transform: translateX(0);
  }

  .terminal-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Overlay when terminal is open */
  body.terminal-open::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
  }
}

@media (max-width: 640px) {
  .terminal-panel {
    max-width: 100%;
  }

  .terminal-quickbar {
    padding: var(--space-2);
  }

  .terminal-toggle {
    width: 48px;
    height: 48px;
    bottom: 16px;
    right: 16px;
  }
}

/* =========================================================================
   Has-Terminal Body Adjustments
   ========================================================================= */

body.has-terminal {
  overflow: hidden;
}

body.has-terminal .site-header {
  max-width: none;
}

body.has-terminal .main-content {
  max-width: 100%;
}