:root {
  --primary: #0d47a1;
  --primary-light: #1565c0;
  --primary-dark: #002171;
  --accent: #ff6f00;
  --accent-light: #ff9100;
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #555;
  --border: #e0e0e0;
  --success: #2e7d32;
  --success-bg: #e8f5e9;
  --warning: #f57f17;
  --warning-bg: #fff8e1;
  --danger: #c62828;
  --danger-bg: #ffebee;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans CJK SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 20px 16px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.header h1 .icon { margin-right: 8px; }

.header nav a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  white-space: nowrap;
}

.header nav a:hover, .header nav a.active {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

/* Container */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 16px;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-card .stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-card .stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Section */
.section {
  margin-bottom: 28px;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-title .badge {
  font-size: 0.7rem;
  background: var(--accent);
  color: white;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 500;
}

/* QSO Cards */
.qso-list { display: flex; flex-direction: column; gap: 10px; }

.qso-card {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 14px;
  transition: transform 0.15s;
}

.qso-card:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }

.qso-card .callsign {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  min-width: 90px;
}

.qso-card .qso-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.qso-card .qso-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.qso-card .qso-meta span { white-space: nowrap; }

.qsl-badge {
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 20px;
  font-weight: 600;
  white-space: nowrap;
}

.qsl-badge.sent { background: var(--success-bg); color: var(--success); }
.qsl-badge.received { background: var(--warning-bg); color: var(--warning); }
.qsl-badge.none { background: #f5f5f5; color: #999; }

/* Login */
.login-container {
  max-width: 400px;
  margin: 60px auto;
  padding: 0 16px;
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px 24px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.login-card h2 { margin-bottom: 8px; color: var(--primary); }
.login-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 20px; }

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 4px;
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.tab-btn {
  flex: 1;
  min-width: 80px;
  padding: 10px 8px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-btn.active {
  background: var(--primary);
  color: white;
}

.tab-btn:hover:not(.active) { background: #f0f0f0; }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Forms */
.form-group { margin-bottom: 14px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--text);
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s;
  background: white;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.1);
}

textarea { resize: vertical; min-height: 120px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-light); }

.btn-accent { background: var(--accent); color: white; }
.btn-accent:hover { background: var(--accent-light); }

.btn-success { background: var(--success); color: white; }
.btn-success:hover { opacity: 0.9; }

.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-block { width: 100%; }

/* Card */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.card h3 { margin-bottom: 16px; font-size: 1rem; color: var(--primary); }

/* Table */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th {
  text-align: left;
  padding: 10px 12px;
  background: #f5f7fa;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  border-bottom: 2px solid var(--border);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tr:hover td { background: #fafbfc; }

/* QSL toggle buttons */
.qsl-toggle {
  display: inline-flex;
  gap: 4px;
}

.qsl-btn {
  padding: 4px 10px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  background: white;
  transition: all 0.15s;
}

.qsl-btn.active-sent { background: var(--success); color: white; border-color: var(--success); }
.qsl-btn.active-received { background: var(--warning); color: white; border-color: var(--warning); }

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}

.empty-state .icon { font-size: 2rem; margin-bottom: 8px; opacity: 0.4; }

/* File upload */
.file-upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 12px;
}

.file-upload-area:hover, .file-upload-area.dragover {
  border-color: var(--primary);
  background: rgba(13, 71, 161, 0.03);
}

.file-upload-area .icon { font-size: 2rem; margin-bottom: 8px; }
.file-upload-area p { color: var(--text-secondary); font-size: 0.9rem; }

/* Footer */
.footer {
  text-align: center;
  padding: 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* Loading */
.loading { text-align: center; padding: 20px; color: var(--text-secondary); }

.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Pagination */
.pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  align-items: center;
}

.pagination button {
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: white;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}

.pagination button:disabled { opacity: 0.4; cursor: not-allowed; }
.pagination button.active { background: var(--primary); color: white; border-color: var(--primary); }

/* Search */
.search-bar {
  margin-bottom: 12px;
}

.search-bar input {
  padding: 8px 12px;
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 640px) {
  .header { padding: 14px 12px; }
  .header h1 { font-size: 1.05rem; letter-spacing: 0; }
  .header nav a { font-size: 0.82rem; padding: 5px 10px; }
  .container { padding: 14px 12px; }
  .stats-grid { grid-template-columns: 1fr; gap: 8px; }
  .stat-card { display: flex; justify-content: space-between; align-items: center; text-align: left; padding: 12px 16px; }
  .stat-card .stat-value { font-size: 1.3rem; }
  .stat-card .stat-label { font-size: 0.78rem; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; gap: 10px; }
  .qso-card { flex-direction: column; align-items: flex-start; gap: 6px; padding: 12px 14px; }
  .qso-card .callsign { min-width: auto; font-size: 1rem; }
  .qso-card .qso-meta { gap: 6px 10px; font-size: 0.76rem; }
  .tabs { flex-wrap: nowrap; gap: 2px; padding: 3px; }
  .tab-btn { font-size: 0.76rem; padding: 8px 6px; min-width: 64px; }
  th, td { padding: 7px 6px; font-size: 0.76rem; }
  .card { padding: 14px 12px; }
  .card h3 { font-size: 0.95rem; margin-bottom: 12px; }
  .btn { padding: 10px 16px; font-size: 0.85rem; }
  .btn-block { width: 100%; }
  .section-title { font-size: 1rem; }
  .section { margin-bottom: 20px; }
  .footer { padding: 16px 12px; font-size: 0.72rem; }
  .map-container { height: 320px; }
  textarea { min-height: 100px; }
  .login-container { margin: 30px auto; }
  .login-card { padding: 24px 20px; }
  .pagination button { padding: 6px 10px; font-size: 0.8rem; }
  .search-bar input { padding: 9px 12px; font-size: 0.85rem; }
  .file-upload-area { padding: 20px 12px; }
  .file-upload-area .icon { font-size: 1.5rem; }
  .file-upload-area p { font-size: 0.82rem; }
}

/* Map Styles */
.map-container {
  width: 100%;
  height: 450px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  position: relative;
  background: #e8eaed;
}

.map-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--text-secondary);
  z-index: 1;
}

.map-loading p { margin-top: 8px; font-size: 0.85rem; }

.map-legend {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.legend-item { display: flex; align-items: center; gap: 6px; }

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.legend-dot.dot-single { background: #1565c0; }
.legend-dot.dot-cluster { background: #ff6f00; }

/* Baidu Map marker styles */
.map-marker-single {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.map-marker-single .marker-pin {
  width: 14px;
  height: 14px;
  background: #1565c0;
  border: 2px solid white;
  border-radius: 50%;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.map-marker-single .marker-label {
  background: rgba(13, 71, 161, 0.65);
  color: white;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 10px;
  margin-top: 2px;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255,255,255,0.5);
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.map-marker-cluster {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #ff6f00, #ff9100);
  border: 3px solid white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(255, 111, 0, 0.4);
  cursor: pointer;
  transition: transform 0.15s;
}

.map-marker-cluster:hover { transform: scale(1.1); }

.map-marker-cluster span {
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
}

/* Info window styles */
.map-info-window {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans CJK SC', sans-serif;
  font-size: 0.82rem;
  line-height: 1.5;
  padding: 4px 0;
}

.map-info-window .info-callsign {
  font-size: 1.1rem;
  font-weight: 700;
  color: #0d47a1;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid #e0e0e0;
}

.map-info-window .info-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
  gap: 12px;
}

.map-info-window .info-label {
  color: #666;
  white-space: nowrap;
  font-size: 0.78rem;
}

.map-info-window .info-value {
  color: #1a1a2e;
  text-align: right;
  font-weight: 500;
}

.map-info-window .info-qsl {
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px solid #e0e0e0;
}

/* Cluster list in info window */
.cluster-list { margin-top: 4px; }

.cluster-item {
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid #f0f0f0;
}

.cluster-item:hover { background: #f5f7fa; }

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

.cluster-callsign {
  font-weight: 600;
  color: #0d47a1;
  font-size: 0.85rem;
}

.cluster-meta {
  font-size: 0.72rem;
  color: #666;
}

/* Baidu Maps info window overrides */
.BMap_pop .BMap_top,
.BMap_pop .BMap_center,
.BMap_pop .BMap_bottom {
  border-radius: 10px;
}

.BMap_pop img { display: none; }

.BMap_pop .BMap_content {
  border-radius: 10px;
  padding: 14px 16px;
  max-height: 400px;
  overflow-y: auto;
}

/* CSV format guide */
.csv-format-guide {
  background: #f5f7fa;
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-bottom: 14px;
}

.csv-format-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}

.csv-fields {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 6px;
}

.csv-field {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  padding: 4px 8px;
  background: white;
  border-radius: 4px;
}

.csv-field-en {
  font-weight: 600;
  color: var(--primary);
}

.csv-field-cn {
  color: var(--text-secondary);
  font-size: 0.72rem;
}

.csv-field-req {
  font-size: 0.68rem;
  background: var(--danger);
  color: white;
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: auto;
}

.csv-format-hint {
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

@media (max-width: 640px) {
  .csv-fields { grid-template-columns: 1fr; }
  .csv-field { font-size: 0.76rem; }
}

/* ===== 编辑弹窗 ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 20px;
  overflow-y: auto;
}

.modal-content {
  background: #fff;
  border-radius: 12px;
  width: 100%;
  max-width: 600px;
  padding: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  margin-top: 20px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid #f0f0f0;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0 8px;
  transition: color 0.2s;
}

.modal-close:hover { color: var(--danger); }

/* 编辑表单内的表单行优化 */
#editForm .form-row { gap: 12px; }
#editForm .form-row-3 { gap: 10px; }

@media (max-width: 640px) {
  .modal-overlay { padding: 10px; }
  .modal-content { padding: 16px; max-height: 90vh; overflow-y: auto; }
  .modal-header h3 { font-size: 1rem; }
}