:root {
  --bg: #f5f3ee;
  --card-bg: #ffffff;
  --primary: #c2410c;
  --primary-light: #ea580c;
  --primary-dark: #9a3412;
  --text: #1c1917;
  --text-secondary: #78716c;
  --border: #e7e5e4;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --info: #2563eb;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

.app { min-height: 100vh; display: flex; flex-direction: column; }

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 8px rgba(194,65,12,0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header h1 { font-size: 20px; font-weight: 600; }
.header .nav { display: flex; gap: 8px; }
.header .nav-item {
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  font-weight: 500;
}
.header .nav-item:hover { background: rgba(255,255,255,0.15); }
.header .nav-item.active { background: rgba(255,255,255,0.25); }

/* Main content */
.main { flex: 1; padding: 24px; max-width: 1400px; margin: 0 auto; width: 100%; }

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

/* Stat cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-align: center;
  border-top: 3px solid var(--primary);
  transition: transform 0.2s;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-card .stat-value { font-size: 32px; font-weight: 700; color: var(--primary); margin: 8px 0; }
.stat-card .stat-label { color: var(--text-secondary); font-size: 13px; }
.stat-card .stat-icon { font-size: 28px; }

/* Table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th { 
  text-align: left;
  padding: 12px 16px;
  background: #fafaf9;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 13px;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}
td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
tr:hover td { background: #fefdfb; }

/* Badges */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-status-0 { background: #fef3c7; color: #92400e; }
.badge-status-1 { background: #dbeafe; color: #1e40af; }
.badge-status-2 { background: #e0e7ff; color: #3730a3; }
.badge-status-3 { background: #d1fae5; color: #065f46; }
.badge-solve-0 { background: #fef3c7; color: #92400e; }
.badge-solve-1 { background: #d1fae5; color: #065f46; }
.badge-solve-2 { background: #fee2e2; color: #991b1b; }
.badge-archive-0 { background: #f3f4f6; color: #4b5563; }
.badge-archive-1 { background: #dbeafe; color: #1e40af; }
.badge-archive-2 { background: #fee2e2; color: #991b1b; }
.badge-archive-3 { background: #d1fae5; color: #065f46; }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #f3f4f6; color: var(--text); }
.btn-secondary:hover { background: #e5e7eb; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Filters */
.filters {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  align-items: center;
}
.filters select, .filters input {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: #fff;
  outline: none;
  transition: border-color 0.2s;
}
.filters select:focus, .filters input:focus { border-color: var(--primary); }
.filters input[type="text"] { min-width: 200px; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}
.modal {
  background: #fff;
  border-radius: var(--radius);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: #fff;
  z-index: 1;
  border-radius: var(--radius) var(--radius) 0 0;
}
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close { font-size: 24px; cursor: pointer; color: var(--text-secondary); border: none; background: none; }
.modal-body { padding: 24px; }
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  position: sticky;
  bottom: 0;
  background: #fff;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* Detail sections */
.detail-section { margin-bottom: 24px; }
.detail-section h4 {
  font-size: 14px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.detail-item { display: flex; flex-direction: column; }
.detail-item .label { color: var(--text-secondary); font-size: 12px; margin-bottom: 2px; }
.detail-item .value { font-weight: 500; }

/* Timeline */
.timeline { list-style: none; padding: 0; }
.timeline-item {
  padding: 12px 0 12px 24px;
  position: relative;
  border-left: 2px solid var(--border);
  margin-left: 8px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
}
.timeline-item .timeline-time { font-size: 12px; color: var(--text-secondary); }
.timeline-item .timeline-content { margin-top: 4px; }

/* Images */
.image-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.image-grid img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--border);
}

/* Upload area */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s;
  margin-bottom: 8px;
}
.upload-area:hover { border-color: var(--primary); }
.upload-preview { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.upload-preview img { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; }
.upload-preview .remove-img {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--danger);
  color: #fff;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  cursor: pointer;
  border: none;
}
.upload-preview .img-wrap { position: relative; }

/* Textarea */
textarea {
  width: 100%;
  min-height: 120px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}
textarea:focus { border-color: var(--primary); }

/* Loading */
.loading { text-align: center; padding: 40px; color: var(--text-secondary); }
.spinner {
  display: inline-block;
  width: 32px;
  height: 32px;
  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; justify-content: center; gap: 8px; margin-top: 16px; align-items: center; }

/* Toast */
.toast {
  position: fixed;
  top: 80px;
  right: 24px;
  padding: 12px 20px;
  border-radius: 8px;
  color: #fff;
  font-weight: 500;
  z-index: 300;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow-lg);
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

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

/* Responsive */
@media (max-width: 768px) {
  .header { flex-direction: column; gap: 12px; }
  .main { padding: 12px; }
  .filters { flex-direction: column; align-items: stretch; }
  .filters select, .filters input { width: 100%; }
}

/* Login */
.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg,#f5f3ee);}
.login-card{background:#fffdf9;border:1px solid #e3ddd3;border-radius:8px;padding:40px 36px;width:360px;max-width:90vw;box-shadow:0 4px 24px rgba(26,25,22,.08);}
.login-logo{font-size:22px;font-weight:800;color:#1a1916;text-align:center;letter-spacing:-.01em;}
.login-sub{font-size:13px;color:#9b9588;text-align:center;margin-top:6px;margin-bottom:28px;}
.login-field{margin-bottom:16px;}
.login-field input{width:100%;padding:12px 14px;border:1.5px solid #d1c9bb;border-radius:6px;font-size:15px;outline:none;transition:border-color .2s;background:#fffdf9;color:#1a1916;}
.login-field input:focus{border-color:#c2410c;}
.login-error{color:#dc2626;font-size:13px;margin-bottom:12px;}
.login-btn{width:100%;padding:12px;background:#1a1916;color:#fff;border:none;border-radius:6px;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s;}
.login-btn:hover{background:#c2410c;}
.login-btn:disabled{opacity:.6;cursor:not-allowed;}