:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --success: #16a34a;
  --warning: #ea580c;
  --danger: #dc2626;
  --rail-width: 68px;
  --subnav-width: 240px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg);
  color: var(--text);
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* 1. Nav Rail (Ganz links: Schmale Icon-Leiste) */
.nav-rail {
  width: var(--rail-width);
  background: #080e1e;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
  border-right: 1px solid #172545;
  flex-shrink: 0;
  z-index: 50;
}

.rail-brand {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #2563eb, #38bdf8);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
  cursor: pointer;
  transition: transform 0.15s ease;
}
.rail-brand:hover {
  transform: scale(1.05);
}

.rail-item {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 1.15rem;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 8px;
  position: relative;
}
.rail-item:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.rail-item.active {
  background: #2563eb;
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}
.rail-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
}
.rail-bottom {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

/* 2. Subnav Spalte (Auf- und einklappbar) */
.subnav-column {
  width: var(--subnav-width);
  background: #0f172a;
  border-right: 1px solid #1e293b;
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  flex-shrink: 0;
  transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1), padding 0.25s ease, opacity 0.25s ease;
  z-index: 40;
}
.subnav-column.collapsed {
  width: 0;
  padding: 0;
  overflow: hidden;
  opacity: 0;
  border-right: none;
}

.subnav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.subnav-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.subnav-btn-toggle {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.15s;
}
.subnav-btn-toggle:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.subnav-section-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #64748b;
  letter-spacing: 0.5px;
  margin: 14px 4px 6px 4px;
}

.subnav-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  color: #94a3b8;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  margin-bottom: 4px;
  text-decoration: none;
}
.subnav-menu-item:hover, .subnav-menu-item.active {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.subnav-menu-item.active {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.12);
}

/* 3. Main Workspace Area */
.main {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
  padding: 28px 32px;
  background: var(--bg);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}
.header p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Badges */
.badge {
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.badge-success { background: #dcfce7; color: #15803d; }
.badge-warning { background: #ffedd5; color: #c2410c; }
.badge-info { background: #e0f2fe; color: #0369a1; }
.badge-secondary { background: #f1f5f9; color: #64748b; }

/* Cards & Grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.stat-val {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
}
.stat-val.primary { color: var(--primary); }
.stat-val.success { color: var(--success); }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-control { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 0.9rem; background: #fff; transition: border-color 0.2s; }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.form-check { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 0.85rem; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; border-radius: 8px; font-size: 0.9rem; font-weight: 600; cursor: pointer; border: none; transition: all 0.2s; text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: #f1f5f9; }

/* Tables */
.table-container { background: #fff; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin-top: 20px; }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.85rem; }
th { background: #f8fafc; padding: 12px 16px; font-weight: 600; color: var(--text-muted); border-bottom: 1px solid var(--border); }
td { padding: 14px 16px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr.clickable-row { cursor: pointer; transition: background 0.15s; }
tr.clickable-row:hover td { background: #f8fafc; }

/* Progress Bar */
.progress-track { width: 100%; height: 8px; background: #e2e8f0; border-radius: 999px; overflow: hidden; margin: 8px 0; }
.progress-bar { height: 100%; background: var(--primary); border-radius: 999px; }

/* Modal Dialog */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(15, 23, 42, 0.6); z-index: 1000; align-items: center; justify-content: center; padding: 20px; }
.modal-overlay.active { display: flex; }
.modal-card { background: #fff; border-radius: 14px; width: 100%; max-width: 800px; max-height: 90vh; overflow-y: auto; padding: 24px; box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.modal-footer { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); }

/* Spinner */
.spinner { display: inline-block; width: 16px; height: 16px; border: 2px solid rgba(255, 255, 255, 0.3); border-radius: 50%; border-top-color: #fff; animation: spin 1s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Dynamic Views */
.view-panel { display: none; }
.view-panel.active { display: block; animation: fadeIn 0.2s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }