/* ==========================================
   Personal Blog - Minimal Styles
   Inspired by Silvia Sapora's personal site
   ========================================== */

/* ---------- CSS Variables (Theme) ---------- */
:root {
  /* Light Mode */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-text: #1a1a2e;
  --color-text-secondary: #374151;
  --color-text-muted: #6b7280;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --color-code-bg: #f3f4f6;
  --color-blockquote-border: #2563eb;
  --color-blockquote-bg: #f0f7ff;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Crimson Pro", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;

  /* Spacing */
  --max-width: 960px;
  --content-padding: 2rem;
  --section-gap: 4rem;

  /* Transitions */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-text: #e2e8f0;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-accent: #60a5fa;
  --color-accent-hover: #93c5fd;
  --color-border: #334155;
  --color-card-bg: #1e293b;
  --color-card-shadow: rgba(0, 0, 0, 0.2);
  --color-code-bg: #1e293b;
  --color-blockquote-border: #60a5fa;
  --color-blockquote-bg: #0f1b33;
}

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

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

body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition), color var(--transition);
  min-height: 100vh;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 1.75rem; letter-spacing: -0.01em; margin-top: 2.5rem; }
h3 { font-size: 1.25rem; margin-top: 2rem; }

p {
  margin-bottom: 1.2rem;
}

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

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

/* ---------- Container ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

/* ---------- Navigation ---------- */
.site-header {
  padding: 1.5rem 0;
  transition: border-color var(--transition);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding) 1.25rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

.site-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--color-text);
}

.nav-links a.active::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
  margin-left: 0.5rem;
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: rotate(15deg);
}

/* Mobile menu button */
.menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
}

.menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  position: absolute;
  left: 0;
  transition: all var(--transition);
}

.menu-btn span:nth-child(1) { top: 0; }
.menu-btn span:nth-child(2) { top: 9px; }
.menu-btn span:nth-child(3) { top: 18px; }

.menu-btn.open span:nth-child(1) {
  transform: rotate(45deg);
  top: 9px;
}

.menu-btn.open span:nth-child(2) {
  opacity: 0;
}

.menu-btn.open span:nth-child(3) {
  transform: rotate(-45deg);
  top: 9px;
}

/* Mobile menu overlay (fixed = out of flex flow on desktop too) */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* ---------- Main Content ---------- */
.main-content {
  padding: 4rem 0 3rem;
  min-height: calc(100vh - 180px);
}

/* ---------- Hero / Intro Section ---------- */
.hero {
  margin-bottom: var(--section-gap);
}

.hero h1 {
  font-size: 2.75rem;
  margin-bottom: 0.5rem;
}

.hero .subtitle {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
  font-weight: 400;
}

.hero .affiliation {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.hero .bio {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

/* Social / Contact Links */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-bottom: 1.5rem;
}

.contact-links a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.contact-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.contact-links .separator {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ---------- Sections ---------- */
.section {
  margin-bottom: var(--section-gap);
}

.section-title {
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.section-text {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

/* ---------- Blog Card List ---------- */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.blog-card {
  padding: 1.5rem;
  border-radius: 8px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.blog-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px var(--color-card-shadow);
  transform: translateY(-2px);
}

.blog-card .post-meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.blog-card h3 {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.blog-card h3 a {
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

.blog-card h3 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.blog-card .post-excerpt {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.blog-card .post-tags {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.tag:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ---------- Blog Post Page ---------- */
.post-header {
  margin-bottom: 2.5rem;
}

.post-header h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.post-header .post-meta {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.9;
}

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

.post-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.post-content h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.post-content h4 {
  margin-top: 1.75rem;
  margin-bottom: 0.6rem;
  font-size: 1.1rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

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

.post-content blockquote {
  border-left: 3px solid var(--color-blockquote-border);
  background: var(--color-blockquote-bg);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 6px 6px 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--color-text);
}

.post-content pre {
  background: var(--color-code-bg);
  padding: 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.88rem;
  line-height: 1.6;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
}

.post-content a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Post Navigation */
.post-navigation {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.post-navigation a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  max-width: 45%;
}

.post-navigation .prev::before {
  content: '← ';
}

.post-navigation .next::after {
  content: ' →';
}

/* ---------- About Page ---------- */
.about-section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.about-intro {
  font-size: 1.1rem;
  line-height: 1.9;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
}

.skills-list li {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.skills-list li:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

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

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  transform: translateX(-5px);
}

.timeline-item .date {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.timeline-item h4 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-item .company {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.timeline-item p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  transition: border-color var(--transition);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.site-footer p {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: 0 2px 10px var(--color-card-shadow);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

/* ---------- Page Header ---------- */
.page-header {
  margin-bottom: 2.5rem;
}

.page-header h1 {
  margin-bottom: 0.5rem;
}

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

/* ---------- Publication-like list ---------- */
.pub-list {
  list-style: none;
  padding: 0;
}

.pub-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.pub-list li:last-child {
  border-bottom: none;
}

.pub-list .pub-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.pub-list .pub-authors {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.2rem;
}

.pub-list .pub-venue {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.3rem;
}

.pub-list .pub-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.3rem;
}

.pub-list .pub-links a {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
}

/* ---------- Resume Button ---------- */
.resume-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.resume-btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
  text-decoration: none;
  color: #fff;
}

[data-theme="dark"] .resume-btn {
  box-shadow: 0 4px 12px rgba(96, 165, 250, 0.2);
}

[data-theme="dark"] .resume-btn:hover {
  box-shadow: 0 6px 20px rgba(96, 165, 250, 0.3);
}

.resume-btn .btn-icon {
  font-size: 1.1rem;
}

/* ---------- Project Detail Page ---------- */
.project-hero {
  margin-bottom: 2.5rem;
}

.project-hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.project-hero .project-subtitle {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.project-hero .project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.project-hero .project-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.project-hero .project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Feature cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.feature-card {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  background: var(--color-card-bg);
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-card-shadow);
}

.feature-card .feature-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.feature-card h4 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Tech stack list */
.tech-detail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.tech-detail-list li {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: all var(--transition);
}

.tech-detail-list li:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.tech-detail-list li .tech-role {
  display: block;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  margin-top: 0.15rem;
}

/* Architecture section */
.arch-diagram {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 2rem;
  margin: 1.5rem 0;
  background: var(--color-card-bg);
  text-align: center;
}

.arch-diagram .arch-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.5rem 0;
}

.arch-diagram .arch-box {
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
}

.arch-box.layer-ui { background: #3b82f6; }
.arch-box.layer-comp { background: #8b5cf6; }
.arch-box.layer-data { background: #059669; }
.arch-box.layer-cloud { background: #d97706; }
.arch-box.layer-ai { background: #dc2626; }

.arch-arrow {
  font-size: 1.2rem;
  color: var(--color-text-muted);
}

/* Highlight box */
.highlight-box {
  border-left: 3px solid var(--color-accent);
  background: var(--color-bg-secondary);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 8px 8px 0;
}

.highlight-box h4 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.highlight-box p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Screenshot placeholder */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}

.screenshot-item {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  text-align: center;
  background: var(--color-card-bg);
}

.screenshot-item .screenshot-placeholder {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.screenshot-item .screenshot-label {
  padding: 0.6rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .screenshot-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Portfolio / Project Cards ---------- */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--color-card-bg);
  transition: all var(--transition);
}

.project-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px var(--color-card-shadow);
  transform: translateY(-4px);
}

.project-card .project-thumb {
  width: 100%;
  height: 120px;
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  overflow: hidden;
}

.project-card .project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  margin: 0;
  border: none;
  border-radius: 0;
}

.project-card .project-body {
  padding: 1.25rem;
}

.project-card .project-body h3 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.project-card .project-body p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.project-card .project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.project-card .project-tech .tech-tag {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: var(--color-accent);
  color: #fff;
  opacity: 0.85;
}

.project-card .project-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.project-card .project-links a {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
}

@media (max-width: 768px) {
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Hero Compact ---------- */
.hero-compact .hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

.hero-compact .hero-tagline {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

/* ---------- Utilities ---------- */
.text-muted {
  color: var(--color-text-muted);
}

.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

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

  :root {
    --content-padding: 1.25rem;
    --section-gap: 3rem;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.4rem; }

  .hero h1 { font-size: 2rem; }

  .post-header h1 { font-size: 1.65rem; }

  .menu-btn {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    background: var(--color-card-bg);
    flex-direction: column;
    padding: 5rem 2rem 2rem;
    gap: 1.5rem;
    transition: right 0.3s ease;
    box-shadow: -4px 0 20px var(--color-card-shadow);
    z-index: 100;
    align-items: flex-start;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-links .theme-toggle {
    margin-left: 0;
    margin-top: 1rem;
  }

  .contact-links {
    gap: 0.4rem 1rem;
  }

  .post-navigation {
    flex-direction: column;
    gap: 1rem;
  }

  .post-navigation a {
    max-width: 100%;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  html { font-size: 14px; }

  .hero h1 { font-size: 1.75rem; }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }

/* ---------- Image Gallery ---------- */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.image-grid img {
  margin: 0;
  width: 100%;
  height: 200px;
  object-fit: cover;
}

/* ---------- Reading Progress ---------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), #8b5cf6);
  z-index: 1000;
  transition: width 0.1s;
}

/* ---------- Selection ---------- */
::selection {
  background: var(--color-accent);
  color: #fff;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}