/* Bootstrap基础样式 - 简化本地版本 */
:root {
  --bs-primary: #0d6efd;
  --bs-secondary: #6c757d;
  --bs-success: #198754;
  --bs-danger: #dc3545;
  --bs-warning: #ffc107;
  --bs-info: #0dcaf0;
  --bs-light: #f8f9fa;
  --bs-dark: #212529;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  background-color: #fff;
}

/* Container */
.container, .container-fluid {
  width: 100%;
  padding-right: 0.75rem;
  padding-left: 0.75rem;
  margin-right: auto;
  margin-left: auto;
}

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -0.75rem;
  margin-left: -0.75rem;
}

.col, .col-md-3, .col-md-6, .col-md-12 {
  flex: 1 0 0%;
  width: 100%;
  padding-right: 0.75rem;
  padding-left: 0.75rem;
}

.col-md-3 { flex: 0 0 25%; max-width: 25%; }
.col-md-6 { flex: 0 0 50%; max-width: 50%; }
.col-md-12 { flex: 0 0 100%; max-width: 100%; }

/* Card */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  word-wrap: break-word;
  background-color: #fff;
  background-clip: border-box;
  border: 1px solid rgba(0,0,0,.125);
  border-radius: 0.375rem;
}

.card-header {
  padding: 0.5rem 1rem;
  margin-bottom: 0;
  background-color: rgba(0,0,0,.03);
  border-bottom: 1px solid rgba(0,0,0,.125);
}

.card-body {
  flex: 1 1 auto;
  padding: 1rem;
}

/* Button */
.btn {
  display: inline-block;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  border-radius: 0.375rem;
  transition: all 0.15s ease-in-out;
}

.btn-primary {
  color: #fff;
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
}

.btn-outline-primary {
  color: var(--bs-primary);
  border-color: var(--bs-primary);
}

.btn-outline-danger {
  color: var(--bs-danger);
  border-color: var(--bs-danger);
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  border-radius: 0.25rem;
}

/* Table */
.table {
  width: 100%;
  margin-bottom: 1rem;
  color: #212529;
  vertical-align: top;
  border-color: #dee2e6;
}

.table th, .table td {
  padding: 0.5rem;
  vertical-align: top;
  border-top: 1px solid #dee2e6;
}

.table-responsive {
  overflow-x: auto;
}

/* Badge */
.badge {
  display: inline-block;
  padding: 0.35em 0.65em;
  font-size: 0.75em;
  font-weight: 700;
  line-height: 1;
  color: #fff;
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: 0.375rem;
}

.bg-primary { background-color: var(--bs-primary) !important; }
.bg-success { background-color: var(--bs-success) !important; }
.bg-warning { background-color: var(--bs-warning) !important; color: #000 !important; }
.bg-danger { background-color: var(--bs-danger) !important; }
.bg-secondary { background-color: var(--bs-secondary) !important; }

/* Nav */
.nav {
  display: flex;
  flex-wrap: wrap;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--bs-primary);
  text-decoration: none;
  transition: all 0.15s ease-in-out;
}

.flex-column {
  flex-direction: column !important;
}

/* Utilities */
.d-flex { display: flex !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }
.text-center { text-align: center !important; }
.text-white { color: #fff !important; }
.text-muted { color: #6c757d !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.me-1 { margin-right: 0.25rem !important; }
.me-2 { margin-right: 0.5rem !important; }

/* Form */
.form-control {
  display: block;
  width: 100%;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  background-color: #fff;
  background-image: none;
  border: 1px solid #ced4da;
  border-radius: 0.375rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-label {
  margin-bottom: 0.5rem;
}

.input-group {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  width: 100%;
}

.input-group-text {
  display: flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: center;
  white-space: nowrap;
  background-color: #e9ecef;
  border: 1px solid #ced4da;
  border-radius: 0.375rem;
}

.d-grid { display: grid !important; }

/* Modal básico */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1050;
  display: none;
  width: 100%;
  height: 100%;
  overflow: hidden;
  outline: 0;
  background: rgba(0,0,0,0.5);
}

.modal-dialog {
  position: relative;
  width: auto;
  margin: 10% auto;
  pointer-events: none;
}

.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  pointer-events: auto;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid rgba(0,0,0,.2);
  border-radius: 0.3rem;
  outline: 0;
}

.list-group {
  display: flex;
  flex-direction: column;
  padding-left: 0;
  margin-bottom: 0;
  border-radius: 0.375rem;
}

.list-group-item {
  position: relative;
  display: block;
  padding: 0.5rem 1rem;
  color: #212529;
  text-decoration: none;
  background-color: #fff;
  border: 1px solid rgba(0,0,0,.125);
}

.list-group-flush .list-group-item {
  border-right: 0;
  border-left: 0;
  border-radius: 0;
}

.spinner-border {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  vertical-align: -0.125em;
  border: 0.125em solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner-border 0.75s linear infinite;
}

.spinner-border-sm {
  width: 0.875rem;
  height: 0.875rem;
  border-width: 0.125em;
}

@keyframes spinner-border {
  to {
    transform: rotate(360deg);
  }
}