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

/* ── Base ────────────────────────────────────────────────────────────────── */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  background: white;
  border-radius: 15px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
  overflow: hidden;
}

.container-wide { max-width: 1600px; }

/* ── Header ──────────────────────────────────────────────────────────────── */
.header {
  background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
  color: white;
  padding: 25px 30px;
  position: relative;
  overflow: hidden;
}
.header::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 100px; height: 100%;
  background: linear-gradient(45deg, rgba(255,255,255,0.1), transparent);
  transform: skewX(-20deg);
}
.header h1 { font-size: 2rem; margin-bottom: 10px; font-weight: 600; }
.header p  { opacity: 0.9; }

/* Logout / user-info (auth-required pages) */
.header-actions {
  position: absolute;
  top: 25px; right: 30px;
  display: flex; align-items: center; gap: 15px;
  z-index: 1;
}
.user-info   { color: rgba(255,255,255,0.9); font-size: 0.9rem; opacity: 0.8; }
.btn-logout  {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: white;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.3s;
}
.btn-logout:hover { background: rgba(255,255,255,0.25); }

/* ── Navigation ──────────────────────────────────────────────────────────── */
.nav-bar {
  background: #f8f9fa;
  padding: 15px 30px;
  border-bottom: 1px solid #e9ecef;
  display: flex; gap: 20px; flex-wrap: wrap;
}
.nav-link {
  color: #667eea;
  text-decoration: none;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 6px;
  transition: all 0.3s ease;
}
.nav-link:hover       { background: #667eea; color: white; }
.nav-link.active      { background: #667eea; color: white; }

/* ── Content wrapper ─────────────────────────────────────────────────────── */
.content { padding: 30px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 12px 25px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn:hover         { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(102,126,234,0.3); }
.btn:disabled      { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-secondary     { background: #6c757d; }
.btn-danger        { background: #dc3545; }
.btn-small         { padding: 6px 12px; font-size: 0.8rem; }

/* ── Forms ───────────────────────────────────────────────────────────────── */
.controls-section {
  padding: 20px 30px;
  background: #f8f9fa;
  border-bottom: 1px solid #e9ecef;
}
.form-row   { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin-bottom: 20px; }
.form-group { display: flex; flex-direction: column; }
.form-group label { margin-bottom: 5px; font-weight: 500; color: #495057; }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px;
  border: 2px solid #e9ecef;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.3s ease;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102,126,234,0.1);
}

/* ── Loading / Spinner ───────────────────────────────────────────────────── */
.loading  { text-align: center; padding: 50px; color: #6c757d; }
.spinner  {
  border: 3px solid #f3f3f3;
  border-top: 3px solid #667eea;
  border-radius: 50%;
  width: 30px; height: 30px;
  animation: spin 1s linear infinite;
  margin: 0 auto 15px;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* ── Alerts ──────────────────────────────────────────────────────────────── */
.alert         { padding: 15px 20px; margin-bottom: 20px; border-radius: 8px; border-left: 4px solid; }
.alert-error   { background: #f8d7da; color: #721c24;  border-color: #dc3545; }
.alert-warning { background: #fff3cd; color: #856404;  border-color: #ffc107; }
.alert-info    { background: #d1ecf1; color: #0c5460;  border-color: #17a2b8; }
.alert-success { background: #d4edda; color: #155724;  border-color: #28a745; }

/* ── Charts ──────────────────────────────────────────────────────────────── */
.chart-container { background: white; border-radius: 10px; padding: 20px; margin-bottom: 30px; box-shadow: 0 5px 15px rgba(0,0,0,0.08); }
.chart-title     { font-size: 1.5rem; font-weight: 600; color: #2c3e50; margin-bottom: 20px; text-align: center; }
.chart-wrapper   { position: relative; height: 400px; }

/* ── Empty / No-results ──────────────────────────────────────────────────── */
.no-results   { text-align: center; padding: 40px; color: #6c757d; font-size: 1rem; }
.empty-state  { text-align: center; padding: 50px; color: #6c757d; }
.empty-state-icon { font-size: 3rem; margin-bottom: 15px; }