:root {
  --bg-color: #fbfbfd;
  --bg-color-rgb: 251, 251, 253;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #dfdfdf;
  --accent-color: #0071e3;
  --accent-hover: #0077ed;
  --card-bg: #ffffff;
  --border-color: rgba(0, 0, 0, 0.05);
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  
  --max-width: 1024px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000000;
    --bg-color-rgb: 0, 0, 0;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #424245;
    --card-bg: #1c1c1e;
    --border-color: rgba(255, 255, 255, 0.1);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.2; letter-spacing: -0.015em; color: var(--text-primary); }
h1 { font-size: 3rem; font-weight: 700; letter-spacing: -0.03em; }
h2 { font-size: 2rem; margin-bottom: var(--spacing-sm); }
p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: var(--spacing-sm); }
a { color: var(--accent-color); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--accent-hover); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md); }
.section { padding: var(--spacing-lg) 0; }
.pt-0 { padding-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }

.btn { display: inline-block; background-color: var(--accent-color); color: #fff; padding: 12px 24px; border-radius: 980px; font-weight: 600; font-size: 0.95rem; cursor: pointer; border: none; transition: background-color 0.2s ease, transform 0.1s ease; }
.btn:hover { background-color: var(--accent-hover); color: #fff; }
.btn:active { transform: scale(0.98); }
.btn-secondary { background-color: var(--text-tertiary); color: var(--text-primary); }
.btn-secondary:hover { background-color: var(--text-secondary); color: #fff; }

.grid { display: grid; gap: var(--spacing-md); }
img { max-width: 100%; height: auto; display: block; }

/* Header */
.header {
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(var(--bg-color-rgb), 0.7);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner { display: flex; justify-content: space-between; align-items: center; height: 52px; }
.logo { font-weight: 700; font-size: 1.1rem; color: var(--text-primary); letter-spacing: 0.02em; }
.nav { display: flex; gap: var(--spacing-sm); }
.nav a { color: var(--text-secondary); font-size: 0.85rem; font-weight: 500; }
.nav a:hover { color: var(--text-primary); }

/* Footer */
.footer { border-top: 1px solid var(--border-color); padding: var(--spacing-lg) 0 var(--spacing-md); margin-top: var(--spacing-xl); }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: var(--spacing-sm); }
.footer-links { display: flex; gap: var(--spacing-md); flex-wrap: wrap; justify-content: center; }
.footer-links a { color: var(--text-secondary); font-size: 0.85rem; }
.footer-links a:hover { color: var(--text-primary); }
.copyright { font-size: 0.8rem; color: var(--text-secondary); }

/* Component Styles */
.app-card { display: flex; align-items: flex-start; gap: var(--spacing-sm); padding: var(--spacing-sm); background-color: var(--card-bg); border-radius: var(--border-radius-md); border: 1px solid var(--border-color); transition: transform 0.2s ease, box-shadow 0.2s ease; text-decoration: none; color: inherit; }
.app-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.app-icon { width: 64px; height: 64px; border-radius: 14px; overflow: hidden; flex-shrink: 0; background-color: var(--border-color); }
.app-icon img { width: 100%; height: 100%; object-fit: cover; }
.app-details { display: flex; flex-direction: column; gap: 4px; }
.app-title { font-size: 1.1rem; margin: 0; }
.app-desc { font-size: 0.9rem; margin: 0; color: var(--text-secondary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.app-tags { display: flex; gap: 6px; margin-top: 4px; }
.tag { font-size: 0.75rem; padding: 2px 8px; background-color: var(--border-color); border-radius: 12px; color: var(--text-secondary); }

.project-card { display: flex; flex-direction: column; background-color: var(--card-bg); border-radius: var(--border-radius-md); border: 1px solid var(--border-color); overflow: hidden; text-decoration: none; color: inherit; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.project-cover { width: 100%; aspect-ratio: 16 / 9; background-color: var(--border-color); }
.project-cover img { width: 100%; height: 100%; object-fit: cover; }
.project-content { padding: var(--spacing-sm) var(--spacing-md); }
.project-title { font-size: 1.25rem; margin-bottom: 4px; }
.project-summary { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: var(--spacing-sm); }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }

.blog-card { display: flex; flex-direction: column; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--border-radius-md); overflow: hidden; text-decoration: none; color: inherit; transition: transform 0.2s, box-shadow 0.2s; }
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.blog-cover { width: 100%; aspect-ratio: 16 / 9; background: var(--border-color); }
.blog-cover img { width: 100%; height: 100%; object-fit: cover; }
.blog-content { padding: var(--spacing-sm) var(--spacing-sm); }
.blog-title { font-size: 1.2rem; margin-bottom: 4px; }
.blog-meta { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.separator { color: var(--border-color); }
.blog-excerpt { font-size: 0.95rem; color: var(--text-secondary); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* Grid Layouts */
.apps-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.projects-grid { grid-template-columns: repeat(auto-fill, minmax(400px, 1fr)); }
.blog-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

/* Sections */
.section-title { font-size: 1.5rem; margin-bottom: var(--spacing-sm); }
.section-header { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: var(--spacing-sm); }
.section-header .section-title { margin-bottom: 0; }
.view-all { font-size: 0.95rem; color: var(--text-secondary); font-weight: 500; }
.view-all:hover { color: var(--text-primary); }
.identity-block { background: var(--card-bg); padding: var(--spacing-md); border-radius: var(--border-radius-md); border: 1px solid var(--border-color); max-width: 600px; margin-top: var(--spacing-md); }
.identity-block p { margin: 0; font-size: 1.05rem; line-height: 1.6; color: var(--text-secondary); }

/* Prose Content */
.prose { margin-top: var(--spacing-md); max-width: 800px; }
.prose h2 { margin-top: var(--spacing-lg); margin-bottom: var(--spacing-sm); font-size: 1.75rem; }
.prose p { font-size: 1.05rem; margin-bottom: var(--spacing-md); line-height: 1.6; }

/* Sub-page Specific */
.page-header { margin-bottom: var(--spacing-lg); }
.page-subtitle { font-size: 1.25rem; color: var(--text-secondary); }