/* ============================================
   CSS Custom Properties (Light/Dark Themes)
   ============================================ */

:root {
  /* Light theme (default) */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-text: #1a1a2e;
  --color-text-muted: #6c757d;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-border: #e9ecef;
  --color-code-bg: #f1f3f5;
  --color-sidebar-bg: #f8f9fa;
  --color-card-bg: #ffffff;
  --color-tag-bg: #e9ecef;
  --color-tag-text: #495057;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0d1117;
    --color-bg-secondary: #161b22;
    --color-text: #e6edf3;
    --color-text-muted: #8b949e;
    --color-primary: #58a6ff;
    --color-primary-hover: #79b8ff;
    --color-border: #30363d;
    --color-code-bg: #161b22;
    --color-sidebar-bg: #010409;
    --color-card-bg: #161b22;
    --color-tag-bg: #21262d;
    --color-tag-text: #c9d1d9;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  }
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: grid;
  grid-template-areas: "sidebar content";
  grid-template-columns: 280px 1fr;
}

/* ============================================
   Sidebar
   ============================================ */

.sidebar {
  grid-area: sidebar;
  background-color: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar__header {
  margin-bottom: 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
}

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

.tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Navigation */
.nav {
  margin-bottom: 2rem;
}

.nav__list {
  list-style: none;
}

.nav__item {
  margin-bottom: 0.25rem;
}

.nav__link {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--color-text);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.nav__link:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.nav__link--active {
  background-color: var(--color-primary);
  color: #ffffff;
}

.nav__link--active:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
}

/* Social Links */
.social {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  border-radius: 8px;
  transition: all 0.15s ease;
}

.social__link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-secondary);
  transform: translateY(-2px);
}

.social__icon {
  width: 18px;
  height: 18px;
}

.sidebar__footer {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ============================================
   Main Content
   ============================================ */

.content {
  grid-area: content;
  padding: 3rem 4rem;
  max-width: 800px;
}

/* ============================================
   Page Styles
   ============================================ */

.page__header {
  margin-bottom: 2rem;
}

.page__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.page__description {
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

/* ============================================
   Post List
   ============================================ */

.post-list {
  list-style: none;
}

.post-list__item {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.post-list__item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.post-list__link {
  text-decoration: none;
  display: block;
}

.post-list__title {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  transition: color 0.15s ease;
}

.post-list__link:hover .post-list__title {
  color: var(--color-primary);
}

.post-list__date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.post-list__excerpt {
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================
   Single Post
   ============================================ */

.post__header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.post__title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.post__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.post__tags {
  display: flex;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

.post__content {
  margin-bottom: 3rem;
}

.post__footer {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.back-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.back-link:hover {
  text-decoration: underline;
}

/* ============================================
   Prose Styles (Post Content)
   ============================================ */

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.prose h2 {
  font-size: 1.5rem;
}

.prose h3 {
  font-size: 1.25rem;
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.prose ul,
.prose ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5rem 0;
}

.prose code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.875em;
  background-color: var(--color-code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

.prose pre {
  background-color: var(--color-code-bg);
  padding: 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.prose th,
.prose td {
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.prose th {
  background-color: var(--color-bg-secondary);
  font-weight: 600;
}

/* ============================================
   Portfolio / Projects Grid
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  list-style: none;
}

.project-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.2s ease;
}

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

.project-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-card__title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.project-card__description {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-card__links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.project-card__link {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
}

.project-card__link:hover {
  text-decoration: underline;
}

/* ============================================
   About Page
   ============================================ */

.about__content {
  max-width: 65ch;
}

.about__avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin-bottom: 1.5rem;
  border: 3px solid var(--color-border);
}

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

@media (max-width: 900px) {
  .content {
    padding: 2rem;
  }
}

@media (max-width: 685px) {
  body {
    grid-template-areas:
      "sidebar"
      "content";
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    padding: 1.5rem;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .sidebar__header {
    margin-bottom: 1rem;
  }

  .tagline {
    display: none;
  }

  .nav__list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .social {
    margin-top: 1rem;
    padding-top: 1rem;
  }

  .sidebar__footer {
    display: none;
  }

  .content {
    padding: 1.5rem;
  }

  .page__title,
  .post__title {
    font-size: 1.75rem;
  }

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

/* ============================================
   Utilities
   ============================================ */

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

/* ============================================
   CV Page Styles
   ============================================ */

.cv-page .content {
  max-width: 900px;
}

.cv-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.75rem 1.25rem;
  background-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.15s ease;
}

.cv-download:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
}

.cv-section {
  margin-bottom: 3rem;
}

.cv-section__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.skill-category h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-border));
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  background-color: var(--color-primary);
  border: 2px solid var(--color-bg);
  border-radius: 50%;
  transform: translateX(-5px);
}

.timeline-content {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.company-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.company-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 8px;
  background-color: var(--color-bg);
  padding: 0.25rem;
}

.job-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.company-name {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.job-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.job-date {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

.job-location,
.job-industry {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  padding: 0.125rem 0.5rem;
  background-color: var(--color-tag-bg);
  border-radius: 4px;
}

.job-highlights {
  list-style: none;
  padding: 0;
  margin: 0;
}

.job-highlights li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-text);
}

.job-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.education-details {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* Certifications */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.cert-icon {
  font-size: 1.5rem;
}

.cert-name {
  font-size: 0.875rem;
  font-weight: 500;
}

/* Languages */
.languages-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.language-item {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.5rem;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  min-width: 150px;
}

.language-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.language-level {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* CV Page Responsive */
@media (max-width: 685px) {
  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-header {
    flex-direction: column;
  }

  .company-logo {
    width: 40px;
    height: 40px;
  }

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

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