/* ====================================
   Modern Minimal Portfolio
   Inspired by Anthropic & ThinkingMachines
   ==================================== */

@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Montserrat:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Neutral Palette - Soft & Professional */
  --bg-primary: #fafaf9;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f4;
  --bg-elevated: #ffffff;
  
  /* Text Hierarchy */
  --text-primary: #1a1a1a;
  --text-secondary: #525252;
  --text-tertiary: #737373;
  --text-muted: #a3a3a3;
  
  /* Accent - Warm Amber */
  --accent-primary: #2a9d8f;
  --accent-hover: #1f776f;
  --accent-light: #d1f2eb;
  --accent-subtle: #e6f7f4;
  
  /* Borders & Dividers */
  --border-primary: #e7e5e4;
  --border-secondary: #f5f5f4;
  --border-focus: #2a9d8f;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Spacing */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

/* ====================================
   Base & Typography
   ==================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Lora', 'Montserrat', 'Segoe UI', -apple-system, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-secondary);
  background: var(--bg-primary);
  font-weight: 400;
  overflow-x: hidden;
}

/* Reading Progress */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-primary);
  z-index: 9999;
  transition: width 100ms ease-out;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 2rem;
  margin-top: 3rem;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1.5rem;
  max-width: 70ch;
}

/* Links */
a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

/* Code */
code {
  font-family: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  font-size: 0.875em;
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

pre {
  position: relative;
  margin: 2rem 0;
  padding: 1.5rem;
  padding-top: 3rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

pre code {
  background: transparent;
  color: var(--text-secondary);
  padding: 0;
  font-weight: 400;
}

/* Copy Button */
.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.5rem 0.875rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-family: 'Montserrat', sans-serif;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.copy-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.copy-btn.copied {
  background: var(--text-primary);
  color: white;
  border-color: var(--text-primary);
}

/* ====================================
   Cards & Components
   ==================================== */

.glass-card,
.scientific-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-sm);
}

.glass-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

/* Post Previews */
.post-preview {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: all var(--transition-slow);
  box-shadow: var(--shadow-sm);
}

.post-preview h3 {
  font-size: 1.25rem;
  margin: 0 0 0.5rem 0;
  color: var(--text-primary);
}

.post-preview .post-meta {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-bottom: 0.75rem;
  font-family: 'Montserrat', sans-serif;
}

.post-preview p {
  font-size: 1rem;
  margin-bottom: 0;
  color: var(--text-secondary);
}

.post-preview:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

/* ====================================
   Navigation
   ==================================== */

.navbar {
  background: rgba(250, 250, 249, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.navbar-brand {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary) !important;
  letter-spacing: -0.01em;
}

.navbar-brand:hover {
  color: var(--accent-primary) !important;
}

.navbar-nav .nav-link {
  font-family: 'Montserrat', sans-serif;
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--text-secondary) !important;
  transition: color var(--transition-base);
  padding: 0.5rem 1rem !important;
}

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

/* ====================================
   Buttons
   ==================================== */

.btn-primary,
.btn-glow {
  background: var(--accent-primary);
  border: none;
  color: white;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all var(--transition-base);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover,
.btn-glow:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: white;
}

/* ====================================
   Metadata
   ==================================== */

.metadata-bar {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  padding: 1rem;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  font-size: 0.875rem;
  color: var(--text-tertiary);
  flex-wrap: wrap;
  font-family: 'Montserrat', sans-serif;
}

.metadata-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.metadata-item svg {
  width: 16px;
  height: 16px;
  color: var(--accent-primary);
}

.metadata-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ====================================
   Table of Contents (Sidebar)
   ==================================== */

.inline-toc {
  position: fixed;
  right: 2rem;
  top: 140px;
  width: 240px;
  max-height: 70vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 45;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.inline-toc-title {
  font-family: 'Montserrat', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

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

.inline-toc li {
  margin-bottom: 0.5rem;
}

.inline-toc a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  border-left: 2px solid transparent;
  font-family: 'Montserrat', sans-serif;
}

.inline-toc a:hover {
  color: var(--accent-primary);
  background: var(--accent-subtle);
  border-left-color: var(--accent-primary);
}

.inline-toc a.active {
  color: var(--accent-primary);
  background: var(--accent-subtle);
  border-left-color: var(--accent-primary);
  font-weight: 600;
}

.inline-toc li ul {
  padding-left: 1rem;
  margin-top: 0.25rem;
}

.inline-toc li ul a {
  font-size: 0.8125rem;
  padding: 0.375rem 0.75rem;
}

/* ====================================
   Post TOC Box
   ==================================== */

.post-toc-box {
  background: var(--accent-subtle);
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2rem 0;
}

.post-toc-box summary {
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  color: var(--text-primary);
  user-select: none;
  margin-bottom: 1rem;
  font-size: 1rem;
  cursor: pointer;
}

.post-toc-box summary:hover {
  color: var(--accent-primary);
}

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

.post-toc-list li {
  margin-bottom: 0.5rem;
}

.post-toc-list a {
  color: var(--accent-primary);
  font-size: 0.9375rem;
  transition: all var(--transition-base);
}

.post-toc-list a:hover {
  color: var(--accent-hover);
  padding-left: 0.5rem;
}

.post-toc-list ul {
  list-style: none;
  padding-left: 1.5rem;
  margin-top: 0.5rem;
}

.post-toc-list ul a {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* ====================================
   Lightbox
   ==================================== */

.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  z-index: 10000;
  align-items: center;
  justify-content: center;
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  position: relative;
  max-width: 90%;
  max-height: 90%;
}

.lightbox-content img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.lightbox-close {
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--text-primary);
  font-size: 1.5rem;
  box-shadow: var(--shadow-lg);
}

.lightbox-close:hover {
  background: var(--accent-primary);
  color: white;
  transform: rotate(90deg);
}

/* ====================================
   Search Trigger Button (Navbar Icon)
   ==================================== */

.search-trigger {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem 1rem !important;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  font-size: 1rem;
}

.search-trigger:hover {
  color: var(--accent-primary);
}

.search-trigger svg {
  width: 20px;
  height: 20px;
}

/* Search Modal Overlay */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 5rem;
  animation: fadeIn 200ms ease-out;
}

.search-modal.active {
  display: flex;
}

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

/* Search Modal Content */
.search-modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  animation: slideUp 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Close Button */
.search-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.75rem;
  cursor: pointer;
  transition: color var(--transition-base);
  z-index: 10;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.search-modal-close:hover {
  color: var(--accent-primary);
}

/* Search Container Inside Modal */
.search-modal .search-container {
  position: relative;
  width: 100%;
  max-width: none;
  padding: 2rem;
}

.search-modal .search-input {
  width: 100%;
  padding: 1.25rem 1.5rem 1.25rem 3rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Lora', sans-serif;
  font-size: 1.0625rem;
  transition: all var(--transition-base);
  position: relative;
}

.search-modal .search-input::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.search-modal .search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: var(--bg-secondary);
  box-shadow: 0 0 0 4px rgba(42, 157, 143, 0.1);
}

/* Search Icon in Modal */
.search-modal .search-icon {
  position: absolute;
  left: 2.5rem;
  top: 2.75rem;
  color: var(--text-muted);
  pointer-events: none;
  width: 20px;
  height: 20px;
  transition: color var(--transition-base);
}

.search-modal .search-input:focus ~ .search-icon {
  color: var(--accent-primary);
}

/* Search Results Container (Modal) */
.search-modal .search-results {
  position: static;
  background: transparent;
  border: none;
  border-radius: 0;
  max-height: 400px;
  overflow-y: auto;
  z-index: 1001;
  display: none;
  box-shadow: none;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-primary);
}

.search-modal .search-results.active {
  display: block;
}

/* Individual Result Item (Modal) */
.search-modal .search-result-item {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-secondary);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

.search-modal .search-result-item:last-child {
  border-bottom: none;
}

.search-modal .search-result-item:hover,
.search-modal .search-result-item.selected {
  background: var(--accent-subtle);
  padding-left: 1.5rem;
}

.search-modal .search-result-item.selected {
  border-left: 3px solid var(--accent-primary);
  padding-left: 1.25rem;
}

/* Result Title (Modal) */
.search-modal .search-result-title {
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  transition: color var(--transition-base);
  font-size: 1rem;
  line-height: 1.3;
}

.search-modal .search-result-item:hover .search-result-title,
.search-modal .search-result-item.selected .search-result-title {
  color: var(--accent-primary);
}

/* Result Excerpt (Modal) */
.search-modal .search-result-excerpt {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-family: 'Lora', sans-serif;
}

/* Result Tags (Modal) */
.search-modal .search-result-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.search-modal .search-result-category {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background: var(--accent-subtle);
  color: var(--accent-primary);
  border: 0.5px solid var(--accent-light);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 600;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--transition-base);
}

.search-modal .search-result-item:hover .search-result-category,
.search-modal .search-result-item.selected .search-result-category {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* No Results Message (Modal) */
.search-modal .search-no-results {
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 1rem;
  font-style: italic;
  font-family: 'Lora', sans-serif;
}

/* Search Hint Text (Modal) */
.search-modal .search-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 1rem;
  text-align: center;
}

/* Scrollbar Styling (Modal) */
.search-modal .search-results::-webkit-scrollbar {
  width: 6px;
}

.search-modal .search-results::-webkit-scrollbar-track {
  background: transparent;
}

.search-modal .search-results::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}

.search-modal .search-results::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ====================================
   Responsive
   ==================================== */

@media (max-width: 768px) {
  .search-modal-content {
    width: 95%;
    max-height: 70vh;
  }

  .search-modal {
    padding-top: 2rem;
  }

  .search-modal .search-container {
    padding: 1.5rem;
  }

  .search-modal .search-icon {
    left: 2rem;
    top: 2.25rem;
  }

  .search-trigger {
    padding: 0.5rem 0.75rem !important;
  }
}

/* ====================================
   Animations
   ==================================== */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ====================================
   Custom Cursor
   ==================================== */

body.custom-cursor {
  cursor: none;
}

.custom-cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-primary);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  transition: transform var(--transition-fast);
  box-shadow: 0 0 8px rgba(217, 119, 6, 0.4);
}

/* ====================================
   Utility
   ==================================== */

.overflow-hidden {
  overflow: hidden;
}

.blog-post {
  max-width: 900px;
  margin: 0 auto;
  padding-right: 0;
  padding-left: 0;
}

.blog-tags {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.blog-tags a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--accent-subtle);
  color: var(--accent-primary);
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: 'Montserrat', sans-serif;
  transition: all var(--transition-base);
}

.blog-tags a:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

/* ====================================
   Responsive
   ==================================== */

@media (max-width: 1200px) {
  .inline-toc {
    width: 200px;
    right: 1rem;
  }
  
  .blog-post {
    padding-right: 240px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.375rem;
  }

  .inline-toc {
    display: none;
  }
  
  .blog-post {
    padding-right: 0;
  }

  .metadata-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}