/* assets/css/main.css — World-Class Minimalist & Polished Design System */
:root {
  --bg-canvas: #090d16;
  --bg-card: #0f172a;
  --bg-card-hover: #17223b;
  --bg-card-subtle: #131c31;
  --bg-secondary: #1e293b;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.4);
  --text-primary: #f8fafc;
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.12);
  --accent-secondary: #818cf8;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.12);
  --accent-purple: #a855f7;
  --accent-blue: #60a5fa;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --max-width: 900px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-canvas: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-card-subtle: #f8fafc;
  --bg-secondary: #f1f5f9;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(2, 132, 199, 0.4);
  --text-primary: #0f172a;
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-dim: #64748b;
  --accent: #0284c7;
  --accent-glow: rgba(2, 132, 199, 0.08);
  --accent-secondary: #6366f1;
  --accent-amber: #d97706;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.08);
  --accent-purple: #7c3aed;
  --accent-blue: #2563eb;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: radial-gradient(circle at 50% 0%, var(--accent-glow) 0%, transparent 60%);
  background-attachment: fixed;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header & Navigation */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(9, 13, 22, 0.85);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

[data-theme="light"] header.site-header {
  background: rgba(248, 250, 252, 0.85);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4.25rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), var(--accent-purple));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

nav.main-nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
}

nav.main-nav a:hover,
nav.main-nav a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] nav.main-nav a:hover,
[data-theme="light"] nav.main-nav a.active {
  background: rgba(0, 0, 0, 0.04);
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

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

/* Hero Section */
.hero {
  padding: 4.5rem 0 3rem;
  border-bottom: 1px solid var(--border-color);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-emerald-glow);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

.status-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-name {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.5rem;
}

.hero-role {
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-bio {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 760px;
  margin-bottom: 1.75rem;
}

.hero-bio strong {
  color: var(--text-primary);
}

/* Social & Action Button Pills */
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}

.btn-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-pill-primary {
  background: var(--accent);
  color: #090d16;
  border-color: var(--accent);
}

.btn-pill-primary:hover {
  background: #7dd3fc;
  color: #090d16;
  border-color: #7dd3fc;
}

[data-theme="light"] .btn-pill-primary {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

[data-theme="light"] .btn-pill-primary:hover {
  background: #0369a1;
  color: #ffffff;
  border-color: #0369a1;
}

/* Section Header */
.section-wrapper {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 2rem;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-link {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 600;
}

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

/* Impact Experience Cards */
.experience-feed {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.company-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}

.company-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.company-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.company-identity {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.company-badge {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.company-name {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.company-role {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.company-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: right;
}

.company-intro {
  font-size: 0.98rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* Nested Project Impact Blocks */
.project-subcard {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

.project-subcard:last-child {
  margin-bottom: 0;
}

.project-subcard:hover {
  background: var(--bg-card-hover);
}

.project-title-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.project-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.tech-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--accent);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

[data-theme="light"] .tech-pill {
  background: rgba(0, 0, 0, 0.03);
}

.impact-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.impact-bullets li {
  position: relative;
  padding-left: 1.25rem;
  line-height: 1.6;
}

.impact-bullets li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.impact-bullets strong {
  color: var(--text-primary);
}

/* Articles Publication Magazine Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .article-card:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.article-card-thumb {
  width: 100%;
  height: 200px;
  overflow: hidden;
  position: relative;
  background: var(--bg-card-subtle);
}

[data-theme="light"] .article-card-thumb {
  background: #f1f5f9;
}

.article-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.article-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.article-tag {
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
}

.article-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.article-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
}

/* Open Source Codebase Bento */
.codebase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.codebase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.codebase-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.codebase-name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.codebase-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.codebase-footer {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Skills & Education Grid */
.skills-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.skill-category-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
}

[data-theme="light"] .skill-chip {
  background: rgba(0, 0, 0, 0.04);
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-top: auto;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
}

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

/* Article Row & Thumbnail Styling for Articles Hub */
.article-row {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: 1.75rem;
  align-items: center;
  transition: var(--transition);
}

.article-row:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .article-row:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.article-thumb {
  width: 200px;
  height: 125px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
}

[data-theme="light"] .article-thumb {
  background: #f1f5f9;
}

.article-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-row-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.article-row-content h3 a {
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
}

.article-row-content h3 a:hover {
  color: var(--accent);
}

.article-row-content p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-badge-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
}

.badge-reading-level {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-weight: 600;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .nav-inner {
    height: auto;
    padding: 0.85rem 0;
    flex-direction: column;
    gap: 0.75rem;
  }
  nav.main-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 0.85rem;
    font-size: 0.85rem;
  }
  nav.main-nav a {
    padding: 0.3rem 0.5rem;
  }
  .hero {
    padding: 3rem 0 2rem;
  }
  .hero-title {
    font-size: 2.2rem;
    line-height: 1.2;
  }
  .hero-actions {
    flex-wrap: wrap;
    gap: 0.6rem;
  }
  .article-row {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .article-thumb {
    width: 100%;
    height: 190px;
  }
  .article-badge-col {
    align-items: flex-start;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .company-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
  .company-meta {
    text-align: left;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .section-title {
    font-size: 1.4rem;
  }
  .brand-wrapper {
    gap: 0.5rem;
  }
  .brand-name {
    font-size: 1rem;
  }
}