* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #0f0f23; color: #fff; line-height: 1.6; }
.container { max-width: 900px; margin: 0 auto; padding: 0 20px; }
header { padding: 40px 0; text-align: center; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
header h1 { font-size: 2.5rem; margin-bottom: 10px; }
.subtitle { color: #ccc; font-size: 1.1rem; }
.tool-nav { display: flex; flex-wrap: wrap; gap: 10px; padding: 20px 0; justify-content: center; }
.nav-btn { background: #1a1a3e; border: 1px solid #333; color: #fff; padding: 10px 20px; border-radius: 8px; cursor: pointer; transition: all 0.3s; }
.nav-btn:hover, .nav-btn.active { background: #667eea; border-color: #667eea; }
.tool-section { display: none; background: #1a1a3e; padding: 30px; border-radius: 12px; margin: 20px 0; }
.tool-section.active { display: block; }
.tool-section h2 { margin-bottom: 20px; color: #667eea; }
.tool-content { display: flex; flex-direction: column; gap: 15px; }
input[type="text"], input[type="number"], input[type="datetime-local"], textarea, select { width: 100%; background: #0f0f23; border: 1px solid #333; color: #fff; padding: 12px; border-radius: 8px; font-size: 1rem; }
textarea { min-height: 120px; resize: vertical; }
.btn-group { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { background: #333; color: #fff; border: none; padding: 10px 20px; border-radius: 8px; cursor: pointer; transition: all 0.3s; }
.btn:hover { background: #444; }
.btn-primary { background: #667eea; }
.btn-primary:hover { background: #5a6fd6; }
.btn-secondary { background: #444; }
.btn-small { padding: 5px 15px; font-size: 0.85rem; background: #333; }
.status { padding: 10px; border-radius: 6px; margin-top: 10px; }
.status.success { background: #10b98120; color: #10b981; }
.status.error { background: #ef444420; color: #ef4444; }
.timestamp-card { background: #0f0f23; padding: 20px; border-radius: 8px; text-align: center; }
.timestamp-value { font-size: 2rem; font-weight: bold; color: #667eea; font-family: monospace; }
.hash-results, .uuid-results { background: #0f0f23; padding: 15px; border-radius: 8px; }
.hash-results p, .uuid-results p { font-family: monospace; word-break: break-all; margin: 5px 0; }
.cron-result { background: #0f0f23; padding: 20px; border-radius: 8px; }
.cron-result code { font-size: 1.5rem; color: #667eea; display: block; margin-bottom: 10px; }
.cron-result ul { list-style: none; margin-top: 10px; }
.cron-result li { padding: 5px 0; color: #aaa; }
.color-preview { width: 100%; height: 60px; border-radius: 8px; margin-top: 10px; }
.color-formats { display: flex; gap: 10px; flex-wrap: wrap; }
.color-formats input { flex: 1; min-width: 150px; }
footer { text-align: center; padding: 30px 0; color: #666; font-size: 0.9rem; }
@media (max-width: 600px) { .nav-btn { padding: 8px 12px; font-size: 0.9rem; } .btn { padding: 8px 15px; } }