:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --accent: #39d353;
  --accent-dark: #176f3c;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
}
[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #161b22;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --border-color: #30363d;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.3);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', sans-serif; background: var(--bg-primary); color: var(--text-primary); line-height: 1.6; transition: background 0.3s, color 0.3s; }
.app-header { background: var(--bg-card); border-bottom: 1px solid var(--border-color); padding: 12px 0; position: sticky; top: 0; z-index: 100; backdrop-filter: blur(12px); }
.brand-section { display: flex; align-items: center; gap: 12px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.logo i { font-size: 1.3rem; color: var(--accent); }
.text-gradient { background: linear-gradient(135deg, var(--accent), #6ee77a); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.brand-badge { font-size: 0.65rem; font-weight: 600; padding: 2px 8px; border-radius: 4px; background: rgba(57,211,83,0.1); color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.btn-icon { width: 36px; height: 36px; border-radius: 8px; border: 1px solid var(--border-color); background: var(--bg-card); color: var(--text-secondary); display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.2s; }
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }
.btn-home { display: flex; align-items: center; gap: 6px; padding: 6px 14px; border-radius: 8px; font-size: 0.8rem; font-weight: 600; background: var(--accent); color: #fff; text-decoration: none; transition: all 0.2s; }
.btn-home:hover { background: var(--accent-dark); color: #fff; }
.main-content { min-height: calc(100vh - 120px); }
.info-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; padding: 32px; box-shadow: var(--shadow); }
.tech-badge { display: inline-block; padding: 4px 12px; border-radius: 6px; font-size: 0.7rem; font-weight: 600; background: rgba(57,211,83,0.08); color: var(--accent); }
.preview-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-lg); }
.preview-header { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); }
.preview-dots { display: flex; gap: 6px; }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }
.preview-url { font-size: 0.75rem; color: var(--text-secondary); font-family: monospace; }
.preview-body { position: relative; height: 500px; overflow: hidden; background: #0d1117; }
.preview-body iframe { width: 100%; height: 100%; border: none; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 20px; transition: all 0.3s; }
.feature-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.app-footer { border-top: 1px solid var(--border-color); }
@media (max-width: 768px) { .btn-home span { display: none; } .brand-badge { display: none; } .preview-body { height: 300px; } }