:root {
  --kefu-primary: #2f6fed;
  --kefu-bg: #f7f9fc;
  --kefu-surface: #ffffff;
  --kefu-panel: #f1f5f9;
  --kefu-panel-strong: #e9eff7;
  --kefu-border: #e2e8f0;
  --kefu-border-strong: #d5dde8;
  --kefu-text: #0f172a;
  --kefu-text-sub: #64748b;
  --kefu-text-muted: #94a3b8;
}

body.kefu-body {
  background: var(--kefu-bg);
  color: var(--kefu-text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh;
}

body.kefu-login-body {
  background: var(--kefu-bg);
  color: var(--kefu-text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
  padding: 16px;
  background-image: radial-gradient(circle at top right, #eaf2ff, #f7f9fc);
}

.kefu-surface {
  background: var(--kefu-surface);
}

.kefu-panel {
  background: var(--kefu-panel);
}

.kefu-panel-strong {
  background: var(--kefu-panel-strong);
}

.kefu-border {
  border-color: var(--kefu-border);
}

.kefu-divider {
  background: var(--kefu-border);
}

.kefu-header {
  background: var(--kefu-surface);
  border-bottom: 1px solid var(--kefu-border);
}

.kefu-footer {
  background: var(--kefu-surface);
  border-top: 1px solid var(--kefu-border);
}

.kefu-card {
  background: var(--kefu-surface);
  border: 1px solid var(--kefu-border);
  border-radius: 0.75rem;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.kefu-table thead tr {
  background: var(--kefu-panel);
  border-bottom: 1px solid var(--kefu-border);
}

.kefu-table tbody {
  border-color: var(--kefu-border);
}

.kefu-table th {
  color: var(--kefu-text-muted);
}

.kefu-modal {
  background: var(--kefu-surface);
  border: 1px solid var(--kefu-border);
  border-radius: 0.75rem;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
}

.modal-overlay {
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.kefu-input,
.kefu-select,
.kefu-textarea {
  background: var(--kefu-panel);
  border: 1px solid var(--kefu-border-strong);
  color: var(--kefu-text);
  border-radius: 0.5rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.kefu-textarea {
  padding: 0.5rem 0.75rem;
  min-height: 5.5rem;
  line-height: 1.5;
  resize: vertical;
}

.kefu-input:focus,
.kefu-select:focus,
.kefu-textarea:focus {
  border-color: var(--kefu-primary);   /* 焦点时的边框颜色 */
  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
}

.kefu-input::placeholder,
.kefu-textarea::placeholder {
  color: var(--kefu-text-muted);
}

.kefu-button-secondary {
  background: var(--kefu-surface);
  border: 1px solid var(--kefu-border);
  color: var(--kefu-text-sub);
}

.kefu-button-secondary:hover {
  background: var(--kefu-panel);
}

.kefu-toggle-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px;
  border-radius: 0.75rem;
  background: var(--kefu-panel);
  border: 1px solid var(--kefu-border);
}

.kefu-toggle-option {
  cursor: pointer;
  border-radius: 0.5rem;
  padding: 0.5rem 1rem;
  font-weight: 600;
  color: var(--kefu-text-sub);
  background: var(--kefu-surface);
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.kefu-toggle-option:has(input:checked) {
  background: var(--kefu-primary);
  color: #ffffff;
  border-color: var(--kefu-primary);
  box-shadow: 0 8px 16px rgba(47, 111, 237, 0.22);
}

input[type="radio"]:not(.sr-only) {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--kefu-border-strong);
  border-radius: 9999px;
  background: #ffffff;
  display: inline-grid;
  place-content: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="radio"]:not(.sr-only)::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  transform: scale(0);
  background: var(--kefu-primary);
  transition: transform 0.15s ease;
}

input[type="radio"]:not(.sr-only):checked {
  border-color: var(--kefu-primary);
  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
}

input[type="radio"]:not(.sr-only):checked::before {
  transform: scale(1);
}

.glass-effect {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--kefu-border);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

@media (min-width: 768px) {
  .login-container {
    transform: scale(0.85);
    transform-origin: center center;
  }
}

@media (max-height: 700px) {
  .login-container {
    padding-top: 2rem;
    padding-bottom: 2rem;
  }
  .brand-logo {
    margin-bottom: 1.5rem;
  }
}

.session-item {
  border-left: 4px solid transparent;
  transition: all 0.2s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.session-item:hover {
  background: var(--kefu-panel);
}

.session-item.active {
  background: rgba(47, 111, 237, 0.1);
  border-left-color: var(--kefu-primary);
}

.session-item.active .session-name {
  color: var(--kefu-primary);
  font-weight: 700;
}

.session-item.unread {
  background: #ecfdf5;
  border-left-color: #34d399;
  animation: pulse-green 1.6s ease-in-out infinite;
}

.session-item.unread .session-name,
.session-item.unread .session-preview {
  color: #047857;
  font-weight: 600;
}

.unread-badge {
  margin-left: auto;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 9999px;
  background: #10b981;
  color: #ffffff;
  font-weight: 700;
}

@keyframes pulse-red {
  0%, 100% { background-color: rgba(239, 68, 68, 0.05); }
  50% { background-color: rgba(239, 68, 68, 0.2); }
}

@keyframes pulse-green {
  0%, 100% { background-color: rgba(16, 185, 129, 0.18); }
  50% { background-color: rgba(16, 185, 129, 0.35); }
}

.animate-pulse {
  animation: pulse-red 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes bounce-avatar {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-25%); }
}

.animate-bounce {
  animation: bounce-avatar 1s infinite;
}

@media (max-width: 1024px) {
  #chat-list, #customer-info {
    position: fixed;
    top: 0;
    bottom: 0;
    width: 85%;
    max-width: 320px;
    z-index: 50;
    transition: transform 0.3s ease-in-out;
    display: flex;
  }
  #chat-list {
    left: 0;
    transform: translateX(-100%);
  }
  #customer-info {
    right: 0;
    transform: translateX(100%);
  }
  #chat-list.active, #customer-info.active {
    transform: translateX(0);
  }
  body.menu-open::after {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 40;
    animation: fade-in 0.3s;
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

input,
button,
.touch-target {
  min-height: 44px;
}