:root {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --fg: #1d1d1f;
  --fg-muted: #86868b;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --border: rgba(0,0,0,0.08);
  --glass: rgba(255,255,255,0.72);
  --glass-border: rgba(255,255,255,0.4);
  --shadow-sm: 0 4px 16px rgba(0,0,0,0.04);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.06);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.08);
  --radius: 20px;
  --radius-sm: 12px;
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1d1d1f;
    --fg: #f5f5f7;
    --fg-muted: #86868b;
    --accent: #2997ff;
    --accent-hover: #4db0ff;
    --border: rgba(255,255,255,0.1);
    --glass: rgba(29,29,31,0.72);
    --glass-border: rgba(255,255,255,0.1);
    --shadow-sm: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  }
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Header */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--glass); backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition), border var(--transition);
}

header.scrolled { background: var(--glass); box-shadow: var(--shadow-sm); }

.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.logo { font-weight: 600; font-size: 1.1rem; letter-spacing: -0.02em; }

.nav-links { display: flex; gap: 8px; list-style: none; }

.nav-links a {
  display: block; padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500; color: var(--fg-muted);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover, .nav-links a.active { color: var(--fg); background: var(--bg-elevated); }

/* Hero */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 120px 24px 80px; position: relative; overflow: hidden;
}

.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0,113,227,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content { text-align: center; max-width: 800px; position: relative; z-index: 1; }

.hero-badge {
  display: inline-block; padding: 6px 16px; border-radius: 100px;
  background: var(--glass); border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px); font-size: 0.8rem; font-weight: 500;
  color: var(--fg-muted); margin-bottom: 32px;
  animation: fadeUp 0.8s var(--transition) both;
}

@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 5rem); font-weight: 700; line-height: 1.1;
  letter-spacing: -0.03em; margin-bottom: 24px;
  animation: fadeUp 0.8s var(--transition) 0.1s both;
}

.hero .highlight { color: var(--accent); }

.hero p.lead {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem); color: var(--fg-muted); max-width: 600px;
  margin: 0 auto 40px; line-height: 1.7;
  animation: fadeUp 0.8s var(--transition) 0.2s both;
}

.hero-ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  animation: fadeUp 0.8s var(--transition) 0.3s both; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px;
  border-radius: 100px; font-size: 0.95rem; font-weight: 600;
  transition: all var(--transition); border: none; cursor: pointer;
}

.btn-primary {
  background: var(--accent); color: white; box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-secondary {
  background: var(--bg-elevated); color: var(--fg); border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg); border-color: var(--fg-muted); }

/* Sections */
section { padding: 100px 0; }

.section-header { text-align: center; margin-bottom: 60px; }

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px;
}

.section-header p { color: var(--fg-muted); font-size: 1.1rem; max-width: 500px; margin: 0 auto; }

/* Cards Grid */
.grid { display: grid; gap: 24px; }

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } }
@media (max-width: 700px) { .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--glass); border: 1px solid var(--glass-border);
  backdrop-filter: saturate(180%) blur(20px); border-radius: var(--radius);
  padding: 32px; transition: all var(--transition); opacity: 0; transform: translateY(30px);
}

.card.visible { opacity: 1; transform: translateY(0); }

.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--border); }

.card-icon {
  width: 48px; height: 48px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), #5e5ce6);
  display: flex; align-items: center; justify-content: center; margin-bottom: 20px;
}

.card-icon svg { width: 24px; height: 24px; stroke: white; }

.card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 10px; }

.card p { color: var(--fg-muted); font-size: 0.95rem; line-height: 1.7; }

/* Blog */
.blog-list { display: flex; flex-direction: column; gap: 20px; }

.blog-card {
  display: grid; grid-template-columns: 280px 1fr; gap: 24px;
  background: var(--glass); border: 1px solid var(--glass-border);
  backdrop-filter: saturate(180%) blur(20px); border-radius: var(--radius);
  padding: 24px; transition: all var(--transition); opacity: 0; transform: translateY(20px);
}

.blog-card.visible { opacity: 1; transform: translateY(0); }

.blog-card:hover { transform: translateX(8px); box-shadow: var(--shadow-md); border-color: var(--border); }

.blog-thumb {
  width: 280px; height: 160px; border-radius: var(--radius-sm); object-fit: cover;
  background: linear-gradient(135deg, var(--accent), #5e5ce6);
}

.blog-meta { display: flex; gap: 16px; font-size: 0.8rem; color: var(--fg-muted); margin-bottom: 8px; }

.blog-card h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 8px; transition: color var(--transition); }

.blog-card:hover h3 { color: var(--accent); }

.blog-card .excerpt { color: var(--fg-muted); line-height: 1.7; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.blog-link { font-weight: 600; font-size: 0.9rem; color: var(--accent); display: inline-flex; align-items: center; gap: 6px; transition: gap var(--transition); }

.blog-link:hover { gap: 10px; }

/* Post Page */
.post-hero { padding: 140px 0 60px; text-align: center; }

.post-hero .blog-meta { justify-content: center; margin-bottom: 16px; }

.post-hero h1 { font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 24px; }

.post-content { max-width: 800px; margin: 0 auto; padding: 0 24px 100px; }

.post-content img { border-radius: var(--radius); margin: 32px 0; box-shadow: var(--shadow-md); }

.post-content h2 { font-size: 1.75rem; font-weight: 700; margin: 48px 0 16px; }

.post-content h3 { font-size: 1.3rem; font-weight: 600; margin: 32px 0 12px; }

.post-content p { margin-bottom: 16px; line-height: 1.8; }

.post-content ul, .post-content ol { margin: 16px 0 16px 24px; line-height: 1.8; }

.post-content code { background: var(--bg); padding: 2px 6px; border-radius: 6px; font-size: 0.9em; }

.post-content pre { background: #1e1e1e; color: #d4d4d4; padding: 24px; border-radius: var(--radius); overflow-x: auto; margin: 24px 0; }

.post-content pre code { background: none; padding: 0; color: inherit; }

.post-content blockquote {
  border-left: 3px solid var(--accent); padding-left: 20px; margin: 24px 0;
  color: var(--fg-muted); font-style: italic;
}

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }

@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }

.about-photo {
  aspect-ratio: 3/4; border-radius: var(--radius); overflow: hidden;
  background: linear-gradient(135deg, var(--accent), #5e5ce6); position: sticky; top: 100px;
}

.about-text h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 24px; }

.about-text .lead { font-size: 1.2rem; color: var(--fg-muted); margin-bottom: 32px; line-height: 1.7; }

.skills { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }

.skill-tag {
  padding: 8px 16px; border-radius: 100px; font-size: 0.85rem; font-weight: 500;
  background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(10px);
  transition: all var(--transition);
}

.skill-tag:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* Footer */
footer {
  padding: 60px 0 30px; border-top: 1px solid var(--border); background: var(--bg-elevated);
}

.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }

@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-brand .logo { font-size: 1.25rem; margin-bottom: 16px; display: block; }

.footer-brand p { color: var(--fg-muted); font-size: 0.9rem; line-height: 1.7; max-width: 300px; }

.footer-col h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--fg-muted); }

.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }

.footer-col a { color: var(--fg); font-size: 0.9rem; transition: color var(--transition); }

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

.footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid var(--border); color: var(--fg-muted); font-size: 0.85rem; }

/* Reveal animations */
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s var(--transition); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal, .card, .blog-card { opacity: 1; transform: none; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--fg-muted); }