:root {
  --primary: #00639b;
  --on-primary: #ffffff;
  --primary-container: #cee5ff;
  --on-primary-container: #001d33;
  --secondary: #51606f;
  --on-secondary: #ffffff;
  --secondary-container: #d4e4f6;
  --on-secondary-container: #0e1d2a;
  --surface: #fdfcff;
  --surface-variant: #e7e0ec;
  --on-surface: #1a1c1e;
  --on-surface-variant: #43474e;
  --outline: #73777f;
  --error: #ba1a1a;
  --error-container: #ffdad6;
  --success: #2e7d32;
  --warning: #f9a825;
  --elevation-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --elevation-2: 0 3px 6px rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.12);
  --elevation-3: 0 10px 20px rgba(0,0,0,0.15), 0 3px 6px rgba(0,0,0,0.10);
  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-large: 12px;
  --radius-xl: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; font-family: 'Roboto', system-ui, -apple-system, sans-serif; background: var(--surface); color: var(--on-surface); }

#app { height: 100%; display: flex; flex-direction: column; }

/* Layout */
.layout { display: flex; height: 100%; }
.nav-rail {
  width: 72px; background: var(--surface); border-right: 1px solid var(--outline);
  display: flex; flex-direction: column; align-items: center; padding: 12px 0; gap: 8px;
  position: fixed; left: 0; top: 0; bottom: 0; z-index: 100;
}
.nav-rail .nav-item {
  width: 56px; height: 56px; border-radius: var(--radius-large);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer; color: var(--on-surface-variant); transition: all 0.2s;
  text-decoration: none; font-size: 11px; gap: 4px;
}
.nav-rail .nav-item:hover, .nav-rail .nav-item.active {
  background: var(--primary-container); color: var(--on-primary-container);
}
.nav-rail .nav-item svg { width: 24px; height: 24px; }

.main-content { flex: 1; margin-left: 72px; display: flex; flex-direction: column; height: 100vh; }

/* Top App Bar */
.top-bar {
  height: 64px; padding: 0 24px; display: flex; align-items: center; justify-content: space-between;
  background: var(--surface); border-bottom: 1px solid var(--outline); box-shadow: var(--elevation-1);
}
.top-bar h1 { font-size: 20px; font-weight: 500; margin: 0; }
.top-bar .actions { display: flex; gap: 8px; align-items: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 24px; border-radius: var(--radius-medium); border: none; cursor: pointer;
  font-size: 14px; font-weight: 500; letter-spacing: 0.025em; transition: all 0.2s;
  text-transform: none; background: var(--primary); color: var(--on-primary);
}
.btn:hover { box-shadow: var(--elevation-2); opacity: 0.92; }
.btn.secondary { background: var(--secondary-container); color: var(--on-secondary-container); }
.btn.outline { background: transparent; border: 1px solid var(--outline); color: var(--primary); }
.btn.small { padding: 6px 16px; font-size: 13px; }
.btn.fab {
  position: fixed; bottom: 24px; right: 24px; width: 56px; height: 56px; border-radius: 16px;
  padding: 0; box-shadow: var(--elevation-3); z-index: 90;
}

/* Cards */
.card {
  background: var(--surface); border-radius: var(--radius-large); padding: 16px;
  box-shadow: var(--elevation-1); border: 1px solid var(--surface-variant);
}
.card.elevated { box-shadow: var(--elevation-2); }

/* Forms */
input, select, textarea {
  padding: 12px 16px; border-radius: var(--radius-medium); border: 1px solid var(--outline);
  background: var(--surface); color: var(--on-surface); font-size: 14px; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
label { display: block; font-size: 12px; color: var(--on-surface-variant); margin-bottom: 4px; margin-top: 12px; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--surface-variant); }
th { font-weight: 500; color: var(--on-surface-variant); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
tr:hover td { background: rgba(0,99,155,0.04); }

/* Map */
#map-container { flex: 1; position: relative; min-height: 0; }
#map { width: 100%; height: 100%; }

/* Panels */
.side-panel {
  width: 360px; background: var(--surface); border-left: 1px solid var(--outline);
  display: flex; flex-direction: column; overflow-y: auto;
}
.panel-header { padding: 16px; border-bottom: 1px solid var(--surface-variant); }
.panel-body { padding: 16px; flex: 1; }

/* Login */
.login-screen {
  display: flex; align-items: center; justify-content: center; height: 100vh;
  background: linear-gradient(135deg, var(--primary-container) 0%, var(--surface) 100%);
}
.login-card { width: 100%; max-width: 400px; padding: 32px; }
.login-card h2 { margin: 0 0 8px; }
.login-card p { color: var(--on-surface-variant); margin-bottom: 24px; }

/* Filters */
.filter-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px;
  border-radius: 8px; background: var(--surface-variant); font-size: 13px; cursor: pointer;
  border: 1px solid transparent;
}
.chip.active { background: var(--primary-container); color: var(--on-primary-container); border-color: var(--primary); }
.chip .close { width: 14px; height: 14px; opacity: 0.6; }
.chip .close:hover { opacity: 1; }

/* Toast */
.toast-container { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; }
.toast {
  padding: 12px 24px; border-radius: var(--radius-medium); color: #fff; font-size: 14px;
  box-shadow: var(--elevation-3); animation: slideUp 0.3s ease;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--error); }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 150; display: flex; align-items: center; justify-content: center; }
.modal { background: var(--surface); border-radius: var(--radius-xl); width: 90%; max-width: 560px; max-height: 90vh; overflow-y: auto; box-shadow: var(--elevation-3); }
.modal-header { padding: 24px 24px 0; display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: 24px; }
.modal-footer { padding: 16px 24px 24px; display: flex; justify-content: flex-end; gap: 8px; }

/* Progress */
.progress-bar { height: 4px; background: var(--surface-variant); border-radius: 2px; overflow: hidden; }
.progress-bar .fill { height: 100%; background: var(--primary); transition: width 0.3s; }

/* Responsive */
@media (max-width: 900px) {
  .nav-rail { display: none; }
  .main-content { margin-left: 0; }
  .bottom-nav {
    position: fixed; bottom: 0; left: 0; right: 0; height: 64px;
    background: var(--surface); border-top: 1px solid var(--outline);
    display: flex; justify-content: space-around; align-items: center; z-index: 100;
  }
  .bottom-nav .nav-item { display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: 11px; color: var(--on-surface-variant); text-decoration: none; }
  .bottom-nav .nav-item.active { color: var(--primary); }
  .bottom-nav .nav-item svg { width: 24px; height: 24px; }
  .side-panel { position: fixed; right: 0; top: 0; bottom: 0; z-index: 120; transform: translateX(100%); transition: transform 0.3s; }
  .side-panel.open { transform: translateX(0); }
}
@media (min-width: 901px) {
  .bottom-nav { display: none; }
}