/* 
   Theme: Minimalist Light (Claude Code Inspired)
   Soft, warm colors, easy on the eyes.
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Soft, warm off-white background */
  --bg-color: #faf9f8; 
  /* Pure white for cards to create subtle depth */
  --surface-color: #ffffff;
  
  /* Text colors - Untitled UI style */
  --text-main: #101828; /* Deep gray-900 for high contrast */
  --text-secondary: #475467; /* Gray-600 for descriptions */
  --text-tertiary: #667085; /* Gray-500 for meta info */
  
  /* Borders and UI elements */
  --border-color: #D0D5DD; /* Crisp gray border */
  --divider-color: #EAECF0;
  
  /* Accents */
  --accent-color: #d97a53; /* Keeping the warm accent as requested */
  --accent-hover: #c26743;
  
  /* Layout constraints */
  --max-width: 800px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 32px;
  --spacing-xl: 64px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; margin-top: var(--spacing-xl); }
h3 { font-size: 1.25rem; margin-top: var(--spacing-lg); }

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

a {
  color: var(--text-main);
  text-decoration: none;
  border-bottom: 1px solid var(--border-color);
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

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

ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
  color: var(--text-secondary);
}

li {
  margin-bottom: var(--spacing-sm);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md) var(--spacing-xl);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
}

/* Header / Nav */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-bottom: 2px solid var(--text-main); /* Thick black line */
  position: sticky;
  top: 0;
  background-color: rgba(250, 249, 248, 0.85); /* Glassmorphism background */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
}

.logo {
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  border-bottom: none;
}

.logo:hover {
  border-bottom: none;
  color: var(--text-main);
}

nav {
  display: flex;
  gap: 16px; /* Відстань між чистими текстовими лінками */
}

nav a {
  border-bottom: none;
  color: var(--text-secondary);
  font-size: 1rem;
  padding: 8px 4px;
  font-weight: 600;
  transition: all 0.2s ease;
}

nav a:hover, nav a.active {
  color: var(--text-main);
  background-color: transparent; /* Без фону, чистий текст */
}

/* Hero Section */
.hero {
  margin-bottom: var(--spacing-xl);
}

.hero .role {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.1rem;
  max-width: 650px;
}

/* Case Studies Cards */
.case-studies-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

@media (min-width: 600px) {
  .case-studies-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: block;
  border-bottom: 1px solid var(--border-color); /* Override default link border */
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.02), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  border-color: #d1cfcb;
}

.card .meta {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-sm);
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--text-main);
}

.card p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Journal Style Layout */
.article-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.article-card {
  display: flex;
  flex-direction: column;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border-bottom: 1px solid var(--border-color);
  text-decoration: none;
}

@media (min-width: 768px) {
  .article-card {
    flex-direction: row;
  }
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 30px -10px rgba(0, 0, 0, 0.08), 0 10px 15px -8px rgba(0, 0, 0, 0.04);
  border-bottom-color: var(--border-color); /* override global a:hover underline */
}

.article-card-image {
  width: 100%;
  height: 200px;
  flex-shrink: 0;
  overflow: hidden;
  border-right: 1px solid var(--border-color);
}

@media (min-width: 768px) {
  .article-card-image {
    width: 200px;
    height: auto;
    align-self: stretch;
  }
}

.article-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.article-card:hover .article-card-image img {
  transform: scale(1.05);
}

.article-card-content {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
  justify-content: flex-start;
}

.article-card-meta {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-sm);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.article-card-meta span {
  display: inline-flex;
  align-items: center;
}

.article-card-meta .read-time {
  color: var(--accent-color);
  font-weight: 500;
  background: rgba(196, 77, 43, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.article-card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--text-main);
  transition: color 0.2s ease;
}

.article-card:hover h3 {
  color: var(--accent-color);
}

.article-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Resume Section */
.resume-section {
  margin-top: var(--spacing-xl);
}

.experience-item {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--divider-color);
  position: relative;
}

.experience-item::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--border-color);
}

.experience-header {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--spacing-sm);
}

@media (min-width: 600px) {
  .experience-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
  }
}

.experience-header h4 {
  margin-bottom: 0;
  font-size: 1.1rem;
}

.experience-header .company {
  color: var(--text-main);
  font-weight: 500;
}

.experience-header .date {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

/* Skills Tags */
.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.skill-tag {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* Article / Markdown Content Styles */
.article-content {
  margin-top: 0;
}

.article-content h2 {
  border-bottom: 1px solid var(--divider-color);
  padding-bottom: var(--spacing-sm);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.article-content ul {
  list-style-type: disc;
}

.article-content blockquote {
  border-left: 3px solid var(--accent-color);
  padding-left: var(--spacing-md);
  margin-left: 0;
  color: var(--text-main);
  font-style: italic;
  background: #f4efeb; /* very soft amber tint */
  padding: var(--spacing-md);
  border-radius: 0 8px 8px 0;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
  .logo {
    display: none;
  }
  header {
    justify-content: center;
    position: relative; /* ВІдключаємо липку шапку на мобільних */
  }
}

/* Fix sticky hover effects on touch devices */
@media (hover: none), (pointer: coarse) {
  a:hover {
    color: inherit !important;
    border-bottom-color: inherit !important;
  }
  nav a:hover {
    color: var(--text-secondary) !important;
  }
  nav a.active {
    color: var(--text-main) !important;
  }
  .article-card:hover {
    transform: none !important;
    box-shadow: none !important;
    border-bottom-color: var(--border-color) !important;
  }
  .article-card:hover h3 {
    color: var(--text-main) !important;
  }
  .article-card:hover .article-card-image img {
    transform: none !important;
  }
  .card:hover {
    transform: none !important;
    box-shadow: none !important;
    border-color: var(--border-color) !important;
  }
  .card:hover h3 {
    color: var(--text-main) !important;
  }
}

* {
  -webkit-tap-highlight-color: transparent !important;
}

/* Premium Touch Animations (Scale Down & Dim) */
.article-card:active, .card:active, .skill-tag:active, nav a:active {
  transform: scale(0.97) !important;
  transition: transform 0.1s cubic-bezier(0.4, 0.0, 0.2, 1), background-color 0.15s ease !important;
}

.article-card:active, .card:active {
  background-color: #f2f0ed !important; /* Легке затемнення (ближче до кольору фону сторінки) */
}

.skill-tag:active, nav a:active {
  background-color: rgba(0, 0, 0, 0.05) !important;
  border-radius: 6px;
}