:root {
  --color-bg: #0a0a0b;
  --color-bg-alt: #111113;
  --color-text: #f5f5f7;
  --color-text-muted: #a1a1aa;
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-border: #27272a;
  --color-card: #18181b;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.6);
  --transition: all 0.2s ease;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container-max: 1100px;
}
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-border: #e5e7eb;
  --color-card: #f3f4f6;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
.header { position: sticky; top: 0; z-index: 100; background: rgba(10,10,11,0.7); backdrop-filter: blur(16px); border-bottom: 1px solid var(--color-border); transition: background-color 0.3s ease, border-color 0.3s ease; }
[data-theme="light"] .header { background: rgba(255,255,255,0.7); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 10px 20px; max-width: var(--container-max); margin: 0 auto; gap: 12px; }
.nav-brand { font-weight: 600; font-size: 1rem; letter-spacing: -0.025em; }
.nav-links { display: flex; gap: 20px; list-style: none; }
.nav-link { color: var(--color-text-muted); font-weight: 500; font-size: 0.9rem; transition: var(--transition); }
.nav-link:hover { color: var(--color-text); }
.nav-actions { display: flex; align-items: center; gap: 6px; }
.nav-toggle, .theme-toggle { display: flex; align-items: center; justify-content: center; background: var(--color-card); border: 1px solid var(--color-border); color: var(--color-text); cursor: pointer; padding: 6px; border-radius: var(--radius); transition: var(--transition); }
.nav-toggle:hover, .theme-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-toggle i, .theme-toggle i, .nav-toggle svg { width: 18px; height: 18px; }
.hero { padding: 60px 0 40px; text-align: center; }
.hero-avatar { width: 100px; height: 100px; margin: 0 auto 20px; border-radius: 50%; overflow: hidden; border: 2px solid var(--color-border); }
.hero-avatar img { width: 100%; height: 100%; object-fit: cover; }
.hero-title { font-size: 2rem; font-weight: 700; letter-spacing: -0.0375em; margin-bottom: 10px; }
.hero-subtitle { font-size: 1.125rem; color: var(--color-primary); font-weight: 500; margin-bottom: 14px; }
.hero-bio { color: var(--color-text-muted); max-width: 550px; margin: 0 auto 28px; font-size: 0.95rem; }
.hero-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: var(--radius); font-weight: 500; font-size: 0.875rem; transition: var(--transition); cursor: pointer; }
.btn i, .btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); }
.btn-secondary { background: var(--color-card); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover { border-color: var(--color-primary); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--color-text); border: 1px solid var(--color-border); }
.btn-outline:hover { border-color: var(--color-primary); background: var(--color-card); }
.section { padding: 50px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-title { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.025em; margin-bottom: 32px; text-align: center; }
.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.about-card { display: flex; align-items: flex-start; gap: 14px; padding: 18px; background: var(--color-card); border-radius: var(--radius); border: 1px solid var(--color-border); }
.about-card i { color: var(--color-primary); flex-shrink: 0; }
.about-card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.about-card p { color: var(--color-text-muted); font-size: 0.875rem; }
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-bottom: 28px; }
.project-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; transition: var(--transition); }
.project-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--color-primary); }
.project-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 10px; }
.project-header h3 { font-size: 1.05rem; font-weight: 600; }
.project-lang { font-size: 0.75rem; color: var(--color-text-muted); background: var(--color-bg); padding: 3px 8px; border-radius: 999px; }
.project-desc { color: var(--color-text-muted); font-size: 0.875rem; margin-bottom: 14px; line-height: 1.5; }
.project-meta { display: flex; gap: 14px; color: var(--color-text-muted); font-size: 0.8125rem; margin-bottom: 16px; }
.project-meta i { width: 14px; height: 14px; vertical-align: -3px; }
.project-link { display: inline-flex; align-items: center; gap: 5px; color: var(--color-primary); font-weight: 500; font-size: 0.875rem; }
.project-link i { width: 14px; height: 14px; }
.project-link:hover { gap: 8px; }
.projects-footer { text-align: center; }
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; max-width: 480px; margin: 0 auto; }
.contact-card { display: flex; align-items: center; gap: 10px; padding: 14px 18px; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); transition: var(--transition); }
.contact-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.contact-card i { color: var(--color-primary); }
.contact-card span { font-weight: 500; font-size: 0.875rem; }
.footer { padding: 28px 0; text-align: center; color: var(--color-text-muted); font-size: 0.8125rem; border-top: 1px solid var(--color-border); }

/* Panel Styles */
.panel {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  z-index: 200;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 20px rgba(0,0,0,0.2);
}
.panel-left.active {
  transform: translateX(0);
}
.panel-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
  z-index: 150;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.panel-overlay.active {
  opacity: 1;
  visibility: visible;
}
.panel-content {
  position: relative;
  z-index: 201;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-bg);
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
}
.panel-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
}
.panel-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  border-radius: var(--radius);
}
.panel-close:hover {
  color: var(--color-text);
  background: var(--color-card);
}
.panel-close i {
  width: 18px;
  height: 18px;
}
.panel-nav {
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.panel-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius);
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
}
.panel-link:hover {
  background: var(--color-card);
  color: var(--color-primary);
}
.panel-link i, .panel-link svg {
  width: 18px;
  height: 18px;
}
.icon-svg {
  flex-shrink: 0;
}
.panel-divider {
  height: 1px;
  background: var(--color-border);
  margin: 8px 0;
}

@media (max-width: 768px) {
  .hero-title { font-size: 1.75rem; }
  .hero-subtitle { font-size: 1rem; }
  .section-title { font-size: 1.375rem; }
  .project-card { padding: 18px; }
}
@media (max-width: 480px) {
  .hero { padding: 50px 0 30px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}