@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Public+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
  --font-sans: 'Public Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, serif;

  --bg-color: #fafafa;
  --bg-card: #ffffff;
  --bg-muted: #f4f4f5;
  --bg-header: rgba(244, 244, 245, 0.8);
  --border-color: #e4e4e7;
  --border-muted: #e4e4e7;
  --text-primary: #18181b;
  --text-muted: #71717a;
  --text-secondary: #52525b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --tag-bg: #f4f4f5;
  --tag-text: #52525b;
  --selection-bg: #c8c8c8;
  --selection-color: #282a30;
  --code-bg: #f4f4f5;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
  --card-hover-shadow: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
}

html.dark {
  --bg-color: #09090b;
  --bg-card: #121214;
  --bg-muted: #18181b;
  --bg-header: rgba(24, 24, 27, 0.8);
  --border-color: #27272a;
  --border-muted: #27272a;
  --text-primary: #f4f4f5;
  --text-muted: #a1a1aa;
  --text-secondary: #d4d4d8;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --tag-bg: #27272a;
  --tag-text: #d4d4d8;
  --selection-bg: #474747;
  --selection-color: #ffffff;
  --code-bg: #18181b;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
  --card-hover-shadow: 0 10px 25px -5px rgba(0,0,0,0.5);
}

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

::selection {
  background-color: var(--selection-bg);
  color: var(--selection-color);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* Container */
.container {
  width: 100%;
  max-width: 58rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (min-width: 640px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.main-container {
  flex: 1;
  padding-top: 5.5rem;
  padding-bottom: 3.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

@media (max-width: 640px) {
  .main-container {
    padding-top: 4.5rem;
    padding-bottom: 2.5rem;
  }
}

/* Floating Navigation Header */
.header-wrapper {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background-color: var(--bg-header);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  color: var(--text-muted);
  transition: color 0.15s ease, background-color 0.15s ease;
}

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

.nav-link.active {
  color: var(--text-primary);
  background-color: var(--border-color);
}

.theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
}

.theme-toggle-btn svg {
  width: 1.125rem;
  height: 1.125rem;
}

.icon-sun { display: none; }
.icon-moon { display: block; }
html.dark .icon-sun { display: block; }
html.dark .icon-moon { display: none; }

/* Page Hero */
.page-hero {
  padding-top: 2rem;
  padding-bottom: 2.5rem;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 2.75rem;
  }
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 36rem;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 640px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.project-image-wrapper {
  width: 100%;
  height: 12rem;
  background-color: var(--bg-muted);
  overflow: hidden;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.5;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.tag-badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: 0.375rem;
  background-color: var(--tag-bg);
  color: var(--tag-text);
}

.project-footer {
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-color);
  background-color: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn:hover:not(:disabled) {
  background-color: var(--bg-muted);
  border-color: var(--text-muted);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn svg {
  width: 0.9rem;
  height: 0.9rem;
}

/* About Page */
.about-hero {
  display: flex;
  flex-direction: column-reverse;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}

@media (min-width: 640px) {
  .about-hero {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.about-portrait {
  width: 14rem;
  height: 14rem;
  border-radius: 0.75rem;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.about-prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.about-prose p {
  margin-bottom: 1.5rem;
}

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

.about-prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.about-prose ul {
  list-style-type: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

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

/* About Socials */
.about-socials {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.25rem;
  max-width: 24rem;
}

.about-social-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.625rem;
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-weight: 500;
  box-shadow: var(--card-shadow);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.about-social-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--card-hover-shadow);
}

.about-social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.about-social-card:hover .about-social-icon {
  color: var(--accent);
}

.about-social-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.about-social-name {
  flex-grow: 1;
}

.about-social-arrow {
  width: 0.875rem;
  height: 0.875rem;
  color: var(--text-muted);
  opacity: 0.5;
  transition: transform 0.15s ease, opacity 0.15s ease, color 0.15s ease;
}

.about-social-card:hover .about-social-arrow {
  opacity: 1;
  transform: translate(2px, -2px);
  color: var(--accent);
}

/* Blog List */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 3rem;
}

.blog-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  text-decoration: none;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.25rem;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

@media (min-width: 640px) {
  .blog-card {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

.blog-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--card-hover-shadow);
}

.blog-card-image-wrap {
  border-radius: 0.5rem;
  overflow: hidden;
  height: 12rem;
  background-color: var(--bg-muted);
}

.blog-card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.blog-card:hover .blog-card-image {
  transform: scale(1.03);
}

.blog-card-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.blog-meta {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.blog-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

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

/* Blog Single Post */
.post-container {
  max-width: 46rem;
  margin: 0 auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  transition: color 0.15s ease;
}

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

.post-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.post-meta-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.post-featured-image {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: 0.75rem;
  margin-bottom: 1.75rem;
  border: 1px solid var(--border-color);
}

.post-title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

@media (min-width: 640px) {
  .post-title {
    font-size: 2.5rem;
  }
}

.post-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.post-author {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  background-color: var(--bg-card);
}

.author-avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 9999px;
  object-fit: cover;
}

.author-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.post-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.post-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.post-body h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.post-body p {
  margin-bottom: 1.5rem;
}

.post-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.post-body ul {
  list-style-type: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

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

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

.post-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.2em 0.4em;
  background-color: var(--code-bg);
  border-radius: 0.25rem;
  border: 1px solid var(--border-color);
}

.post-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background-color: var(--text-primary);
  color: var(--bg-color);
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

@media (min-width: 640px) {
  .footer {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-credits {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-link {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem;
  border-radius: 0.375rem;
  transition: color 0.15s ease, background-color 0.15s ease;
}

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

.footer-link svg {
  width: 1.125rem;
  height: 1.125rem;
}