/* ============================================
   Modern Theme for dev.page
   Clean, contemporary, minimalist design
   ============================================ */

/* --------------------------------------------
   CSS Custom Properties
   -------------------------------------------- */
:root {
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Layout */
  --content-width: 720px;
  --header-height: 64px;

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

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* Light theme (default) */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f4;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --border-color: #e5e7eb;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1f1f1f;
  --text-primary: #fafafa;
  --text-secondary: #a1a1a1;
  --text-tertiary: #666666;
  --border-color: #2e2e2e;
  --accent-color: #3b82f6;
  --accent-hover: #60a5fa;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------
   Typography
   -------------------------------------------- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }

p {
  color: var(--text-secondary);
}

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

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

/* --------------------------------------------
   Header
   -------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
}

.header-content {
  width: 100%;
  padding: 0 var(--spacing-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.logo {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--text-primary);
}

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

.nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-lg);
}

.nav a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.nav a.active {
  color: var(--text-primary);
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 2px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}

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

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

/* --------------------------------------------
   Main Content
   -------------------------------------------- */
.main-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + var(--spacing-3xl)) var(--spacing-lg) var(--spacing-3xl);
}

/* --------------------------------------------
   Hero Section
   -------------------------------------------- */
.hero {
  margin-bottom: var(--spacing-3xl);
}

.hero-name {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.hero-location {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-xl);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.hero-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.hero-bio {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

/* --------------------------------------------
   Section Styles
   -------------------------------------------- */
.section {
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

/* --------------------------------------------
   Experience
   -------------------------------------------- */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.experience-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-md);
}

.experience-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.experience-company {
  font-weight: 600;
  color: var(--text-primary);
}

.experience-role {
  color: var(--text-secondary);
}

.experience-date {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  text-align: right;
}

.experience-highlights {
  grid-column: 1 / -1;
  list-style: none;
  padding-left: 0;
  margin-top: var(--spacing-sm);
}

.experience-highlights li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.experience-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--accent-color);
  border-radius: 50%;
}

/* --------------------------------------------
   Projects
   -------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-card.featured {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-color);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.project-name {
  font-size: 1rem;
  font-weight: 600;
}

.project-link {
  font-size: 0.75rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--accent-color);
  color: white;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.project-link:hover {
  background: var(--accent-hover);
  color: white;
}

.project-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.project-tag {
  font-size: 0.75rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  border-radius: var(--radius-sm);
}

/* --------------------------------------------
   Skills
   -------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.skill-category {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.skill-category-name {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-sm);
}

.skill-list {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------
   Writing
   -------------------------------------------- */
.writing-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.writing-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.writing-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.writing-title {
  font-weight: 500;
  color: var(--text-primary);
}

.writing-title:hover {
  color: var(--accent-color);
}

.writing-date {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  margin-left: var(--spacing-md);
}

.writing-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

/* --------------------------------------------
   Education
   -------------------------------------------- */
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.education-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-sm);
}

.education-institution {
  font-weight: 600;
  color: var(--text-primary);
}

.education-degree {
  color: var(--text-secondary);
}

.education-date {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  text-align: right;
}

/* --------------------------------------------
   Footer
   -------------------------------------------- */
.site-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.site-footer p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* --------------------------------------------
   Responsive
   -------------------------------------------- */
@media (max-width: 640px) {
  :root {
    --header-height: 56px;
  }

  .header-content {
    padding: 0 var(--spacing-md);
  }

  .nav {
    display: none;
  }

  .main-content {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .hero-name {
    font-size: 2rem;
  }

  .experience-item {
    grid-template-columns: 1fr;
  }

  .experience-date {
    text-align: left;
    order: -1;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .writing-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }

  .writing-date {
    margin-left: 0;
  }

  .education-item {
    grid-template-columns: 1fr;
  }

  .education-date {
    text-align: left;
  }
}

/* --------------------------------------------
   Multi-Page Styles
   -------------------------------------------- */

/* Page Header */
.page-header {
  margin-bottom: var(--spacing-3xl);
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* View All Link */
.view-all-link {
  display: inline-block;
  margin-top: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--accent-color);
}

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

/* Experiments Grid */
.experiments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.experiment-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

.experiment-card h3 {
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
}

.experiment-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.experiment-links {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.875rem;
}

/* Project Page */
.project-page .project-page-header {
  margin-bottom: var(--spacing-3xl);
}

.project-page .project-page-header h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.project-page .project-page-header .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.project-page .project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.project-page .meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.project-page .meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.project-page .meta-value {
  font-size: 0.875rem;
  color: var(--text-primary);
}

.project-page .project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.project-link-btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.project-link-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.project-meta-inline {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-sm);
}

/* Project Content Prose */
.prose {
  line-height: 1.7;
}

.prose h2 {
  font-size: 1.25rem;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.prose h3 {
  font-size: 1rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.prose p {
  margin-bottom: var(--spacing-md);
}

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

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

.prose code {
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

/* Project Navigation */
.project-nav {
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-3xl);
}

.back-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

/* Writing List Full */
.writing-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.writing-item:hover {
  color: var(--accent-color);
}

.writing-item:last-child {
  border-bottom: none;
}

.writing-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.writing-publication {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* Print styles */
@media print {
  .site-header,
  .theme-toggle {
    display: none !important;
  }

  .main-content {
    padding-top: 0;
  }

  body {
    color: black;
    background: white;
  }
}