/*
Theme Name: JS Lee Academic & Portfolio Theme
Description: A modern WordPress theme for academic content, startup documents, and professional portfolios with multilingual support.
Version: 1.0.0
Author: JS Lee
Text Domain: js-lee-theme
*/

/* =============================================================================
   CSS Variables & Root Styles
   ========================================================================== */
:root {
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  --font-family-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, 'Courier New', monospace;
  
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #64748b;
  --color-success: #059669;
  --color-danger: #dc2626;
  --color-warning: #d97706;
  --color-info: #0ea5e9;
  
  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-dark: #1e293b;
  --color-bg-darker: #0f172a;
  
  --border-radius: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --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);
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
}

/* =============================================================================
   Base Styles & Typography
   ========================================================================== */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-primary);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
}

h1 { font-size: 2.25rem; font-weight: 700; }
h2 { font-size: 1.875rem; font-weight: 600; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; font-weight: 500; }

p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

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

/* =============================================================================
   Layout & Structure
   ========================================================================== */
.site {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* =============================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary) !important;
}

.navbar-nav .nav-link {
  font-weight: 500;
  color: var(--color-text-primary) !important;
  padding: 0.5rem 1rem !important;
  transition: color 0.2s ease-in-out;
}

.navbar-nav .nav-link:hover {
  color: var(--color-primary) !important;
}

.navbar-nav .nav-link.active {
  color: var(--color-primary) !important;
  font-weight: 600;
}

/* Language Dropdown Styles */
.lang-text {
  font-size: 0.875rem;
  font-weight: 500;
}

.dropdown-menu {
  border: none;
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.dropdown-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  transition: background-color 0.2s ease-in-out;
}

.dropdown-item:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.dropdown-item.active {
  background-color: var(--color-primary);
  color: white;
}

.dropdown-item.active:hover {
  background-color: var(--color-primary-hover);
  color: white;
}

/* Skip Link */
.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 999999;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-text-primary);
  color: white;
  text-decoration: none;
}

.skip-link:focus {
  left: 6px;
  top: 7px;
}

/* =============================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #222 !important;
  color: #ddd !important;
  margin-top: auto;
}

.site-footer p {
  color: #ddd !important;
  margin-bottom: 0;
}

.site-footer .text-secondary {
  color: #ddd !important;
}

.site-footer a {
  color: #ddd;
  transition: color 0.2s ease-in-out;
}

.site-footer a:hover {
  color: #ffffff;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: background-color 0.2s ease-in-out;
}

.social-links a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* =============================================================================
   Content & Post Styles
   ========================================================================== */
.entry-content {
  margin-bottom: var(--spacing-2xl);
}

.entry-content > * {
  margin-bottom: var(--spacing-lg);
}

.entry-content h1,
.entry-content h2,
.entry-content h3,
.entry-content h4,
.entry-content h5,
.entry-content h6 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.entry-content h1:first-child,
.entry-content h2:first-child,
.entry-content h3:first-child,
.entry-content h4:first-child,
.entry-content h5:first-child,
.entry-content h6:first-child {
  margin-top: 0;
}

/* Academic Content Styles */
.academic-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  background: var(--color-bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.sop-collection {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.portfolio-item {
  border: 1px solid #e2e8f0;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  transition: box-shadow 0.2s ease-in-out;
}

.portfolio-item:hover {
  box-shadow: var(--shadow-md);
}

/* =============================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
  h1 { font-size: 1.875rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .site-main {
    padding: var(--spacing-xl) 0;
  }
  
  .academic-content {
    padding: var(--spacing-lg);
    margin: var(--spacing-md);
  }
  
  .navbar-brand {
    font-size: 1.25rem;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .site-footer .row {
    text-align: center;
  }
  
  .site-footer .text-md-end {
    text-align: center !important;
  }
}

/* =============================================================================
   Utility Classes
   ========================================================================== */
.text-balance {
  text-wrap: balance;
}

.visually-hidden,
.screen-reader-text {
  clip: rect(1px, 1px, 1px, 1px);
  position: absolute !important;
  height: 1px;
  width: 1px;
  overflow: hidden;
}

.visually-hidden:focus,
.screen-reader-text:focus {
  background-color: #f1f1f1;
  border-radius: 3px;
  box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
  clip: auto !important;
  color: #21759b;
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  height: auto;
  left: 5px;
  line-height: normal;
  padding: 15px 23px 14px;
  text-decoration: none;
  top: 5px;
  width: auto;
  z-index: 100000;
}

/* =============================================================================
   WordPress Core Styles
   ========================================================================== */
.alignleft {
  float: left;
  margin-right: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.alignright {
  float: right;
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.aligncenter {
  clear: both;
  display: block;
  margin: var(--spacing-lg) auto;
}

.wp-caption {
  margin-bottom: var(--spacing-lg);
  max-width: 100%;
}

.wp-caption img {
  display: block;
  margin: 0 auto;
}

.wp-caption-text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  text-align: center;
  margin-top: var(--spacing-sm);
}

/* =============================================================================
   Projects Page Styles
   ========================================================================== */
.projects-page .project-item {
  transition: transform 0.2s ease-in-out;
}

.projects-page .project-item:hover {
  transform: translateY(-2px);
}

.project-image-placeholder {
  border: 2px dashed #dee2e6;
  transition: border-color 0.2s ease-in-out;
}

.project-item:hover .project-image-placeholder {
  border-color: var(--color-primary);
}

.project-title {
  color: var(--color-text-primary);
  font-weight: 600;
}

.project-meta .badge {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}

.tech-tags .badge {
  font-size: 0.7rem;
  padding: 0.2rem 0.4rem;
  border: 1px solid #dee2e6;
}

.project-details-expanded {
  border-left: 4px solid var(--color-primary);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.timeline-item {
  position: relative;
  padding-left: 1rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.3rem;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
}

.timeline-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 1rem;
  width: 2px;
  height: calc(100% + 0.5rem);
  background: #dee2e6;
}

.future-projects {
  border: 2px dashed #dee2e6;
  border-radius: var(--border-radius-lg);
}

.project-actions .btn {
  transition: all 0.2s ease-in-out;
}

.project-actions .btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* =============================================================================
   Block Editor Styles
   ========================================================================== */
.wp-block-quote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.wp-block-pullquote {
  border-top: 4px solid var(--color-primary);
  border-bottom: 4px solid var(--color-primary);
  padding: var(--spacing-xl) 0;
  text-align: center;
  font-size: 1.25rem;
  font-style: italic;
  margin: var(--spacing-2xl) 0;
}

.wp-block-code {
  background: var(--color-bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  overflow-x: auto;
}

.wp-block-preformatted {
  background: var(--color-bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  overflow-x: auto;
  white-space: pre-wrap;
}