:root {
  --primary: #3a86ff;
  --primary-dark: #2563eb;
  --success: #52c41a;
  --warning: #faad14;
  --danger: #ff4d4f;
  --bg: #f0f2f5;
  --text: #333;
  --text-secondary: #666;
  --border: #e8e8e8;
  --white: #fff;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--white);
  padding: 16px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.header-bar h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(90deg, #3a86ff, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.white-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 0;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}

.white-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: linear-gradient(90deg, #fdfbfb 0%, #ebedee 100%);
  cursor: pointer;
  user-select: none;
}

.white-body {
  padding: 20px;
  border-top: 1px solid var(--border);
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.12); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-secondary { background: #f0f0f0; color: #333; }
.btn-monitor { background: #13c2c2; color: #fff; }

.select-input {
  padding: 10px 14px;
  border: 2px solid rgba(58, 134, 255, 0.3);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  transition: all 0.3s ease;
  min-width: 140px;
}

.select-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.15);
}

.date-input {
  padding: 10px 14px;
  border: 2px solid rgba(58, 134, 255, 0.3);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  transition: all 0.3s ease;
}

.date-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.15);
}

.name-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

.name-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  background: #f8f9fa;
  border-radius: 10px;
  font-size: 14px;
  border: 1px solid #e9ecef;
  transition: all 0.2s;
}

.name-item:hover { background: #e9ecef; }

.name-item .name-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.name-item .name-main {
  font-weight: 600;
  color: #333;
}

.name-item .name-sub {
  font-size: 12px;
  color: #999;
}

.name-item .del {
  color: #ff4d4f;
  cursor: pointer;
  font-size: 18px;
  padding: 4px;
  border-radius: 6px;
  transition: all 0.2s;
}

.name-item .del:hover { background: #fff1f0; }

.table-wrap {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 800px;
}

thead {
  background: #fafafa;
}

th, td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: #333;
  white-space: nowrap;
}

tbody tr:hover { background: #fafafa; }

.empty-state {
  text-align: center;
  color: #999;
  padding: 30px;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 20px;
}

.modal-box {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  width: 100%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid #eee;
}

.modal-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.close {
  font-size: 28px;
  color: #999;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.close:hover { color: #333; }

.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: rgba(0,0,0,0.8);
  color: #fff;
  padding: 12px 24px;
  border-radius: 10px;
  z-index: 3000;
  font-size: 14px;
  font-weight: 500;
  transition: transform 0.3s ease;
}

.toast.show { transform: translateX(-50%) translateY(0); }

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  z-index: 4000;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255,255,255,0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-progress {
  width: 200px;
  height: 6px;
  background: rgba(255,255,255,0.2);
  border-radius: 3px;
  margin-top: 16px;
  overflow: hidden;
}

.loading-progress-bar {
  height: 100%;
  width: 0%;
  background: #fff;
  border-radius: 3px;
  transition: width 0.3s ease;
}

.confirm-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2500;
  padding: 20px;
}

.confirm-box {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.confirm-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.confirm-content {
  font-size: 15px;
  color: #666;
  margin-bottom: 20px;
  line-height: 1.6;
}

.confirm-btns {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: #f8f9fa;
  border-radius: 10px;
  border: 1px solid #e9ecef;
  font-size: 14px;
}

.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.filter-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}

.input-wrapper {
  position: relative;
}

.suggestions-box {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid #ddd;
  border-top: none;
  border-radius: 0 0 10px 10px;
  max-height: 200px;
  overflow-y: auto;
  z-index: 100;
  display: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.suggestions-box.show { display: block; }

.suggestion-item {
  padding: 10px 12px;
  cursor: pointer;
  font-size: 14px;
  border-bottom: 1px solid #f0f0f0;
}

.suggestion-item:last-child { border-bottom: none; }

.suggestion-item:hover { background: #f5f5f5; }

.pagination-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.page-info {
  font-size: 14px;
  color: #666;
}

.pagination-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.page-btn {
  padding: 8px 14px;
  border: 1px solid #ddd;
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

.page-btn:hover { background: #f5f5f5; border-color: #bbb; }
.page-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.page-input {
  width: 60px;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
}

.class-avg-box {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  padding: 14px;
  background: #f0f8ff;
  border-radius: 10px;
  border: 1px solid #d6eaff;
}

.class-avg-item {
  font-size: 15px;
  font-weight: 600;
}

.log-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.log-filter {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.log-item {
  padding: 12px 14px;
  border-bottom: 1px solid #f0f0f0;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.log-item:last-child { border-bottom: none; }

.log-time {
  color: #999;
  white-space: nowrap;
}

.log-content {
  flex: 1;
}

.log-type {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  margin-right: 8px;
}

.log-type-login { background: #e6f7ff; color: #1890ff; }
.log-type-student { background: #f6ffed; color: #52c41a; }
.log-type-config { background: #fff7e6; color: #fa8c16; }
.log-type-data { background: #fff1f0; color: #ff4d4f; }

.status-msg {
  font-size: 13px;
  color: #52c41a;
  font-weight: 500;
}

.import-label, .export-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  background: #f0f0f0;
  color: #333;
}

.import-label:hover, .export-label:hover {
  background: #e0e0e0;
  transform: translateY(-1px);
}

#importFile { display: none; }