:root {
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --border: #e2e8f0;
  --highlight: #fef08a;
  --tag-bg: #e0f2fe;
  --tag-text: #0369a1;
  --id-badge: #475569;
  --sidebar-w: 220px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

/* ================= 登录遮罩与弹窗 ================= */
.login-mask {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.login-card {
  width: 360px;
  background: #ffffff;
  border-radius: 16px;
  padding: 36px 32px 32px;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(226, 232, 240, 0.8);
  animation: modalEnter 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalEnter {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.login-header {
  text-align: center;
  margin-bottom: 24px;
}

.login-logo {
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.login-header h3 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--text-main);
  font-weight: 700;
}

.login-header p {
  margin: 6px 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.login-input-group {
  margin-bottom: 16px;
}

.login-input-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: #475569;
  margin-bottom: 6px;
}

.login-input-group input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  font-size: 0.92rem;
  outline: none;
  box-sizing: border-box;
  transition: all 0.2s;
}

.login-input-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.login-error {
  display: none;
  color: #ef4444;
  font-size: 0.82rem;
  margin-bottom: 14px;
  text-align: center;
}

.login-submit-btn {
  width: 100%;
  height: 42px;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.login-submit-btn:hover {
  background-color: var(--primary-hover);
}

/* ================= 左右分栏与侧边栏 ================= */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar-fixed {
  width: var(--sidebar-w);
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  background: #ffffff;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 2000;
}

.sidebar-brand {
  padding: 24px 20px 18px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand h2 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.sidebar-brand p {
  margin: 4px 0 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.sidebar-nav {
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.nav-icon {
  font-size: 1.2rem;
}

.nav-text {
  font-size: 0.96rem;
  font-weight: 500;
  color: #334155;
}

.nav-btn:hover {
  background-color: #f1f5f9;
}

.nav-btn.active {
  background-color: var(--tag-bg);
  border-color: rgba(2, 132, 199, 0.25);
}

.nav-btn.active .nav-text {
  color: var(--primary);
  font-weight: 600;
}

.sidebar-user-box {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}

.user-avatar {
  font-size: 1rem;
}

.user-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.logout-btn {
  border: none;
  background: transparent;
  color: #ef4444;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.15s;
}

.logout-btn:hover {
  background: #fee2e2;
}

.sidebar-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

#currentStatusDot {
  font-size: 0.9rem;
  color: #22c55e;
}

/* ================= 主内容区 ================= */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  max-width: calc(100vw - var(--sidebar-w));
  padding: 0 36px 80px;
}

.search-sticky-wrapper {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(248, 250, 252, 0.82);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  padding-top: 18px;
  padding-bottom: 20px;
}

.search-sticky-wrapper::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -28px;
  height: 28px;
  background: linear-gradient(
    to bottom,
    rgba(248, 250, 252, 0.82) 0%,
    rgba(248, 250, 252, 0.4) 50%,
    rgba(248, 250, 252, 0) 100%
  );
  pointer-events: none;
}

header {
  margin-bottom: 14px;
}

h1 {
  font-size: 1.45rem;
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.search-box-card {
  background: rgba(255, 255, 255, 0.92);
  padding: 18px 22px;
  border-radius: 12px;
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.search-input-wrapper {
  position: relative;
  width: 100%;
}

.search-input {
  width: 100%;
  height: 42px;
  padding: 0 40px 0 14px;
  font-size: 0.95rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  outline: none;
  background-color: #ffffff;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.clear-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 1.15rem;
  cursor: pointer;
  display: none;
  padding: 4px 6px;
  line-height: 1;
}

.clear-btn:hover {
  color: var(--text-main);
}

.controls-row {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

.filter-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: #475569;
  white-space: nowrap;
}

select {
  height: 34px;
  padding: 0 28px 0 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background-color: #ffffff;
  font-size: 0.86rem;
  color: var(--text-main);
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11.5l-5-5h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.2s;
}

select:focus {
  border-color: var(--primary);
}

#versionFilter,
#bookFilter {
  width: 280px;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

#pageSizeSelect {
  width: 90px;
}

.status-text {
  margin-left: auto;
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* ================= 问答列表与卡片 ================= */
.qa-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 10px;
}

.qa-card {
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 20px 24px;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.02);
  transition: all 0.2s ease;
}

.qa-card:hover {
  border-color: #cbd5e1;
  box-shadow: 0 6px 14px -3px rgba(15, 23, 42, 0.06);
}

.meta-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

.id-badge {
  background: var(--id-badge);
  color: #fff;
  padding: 3px 8px;
  border-radius: 5px;
  font-weight: 600;
  font-size: 0.76rem;
}

.badge-ver {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  padding: 3px 10px;
  border-radius: 5px;
  font-weight: 500;
}

.badge-book {
  background-color: #f1f5f9;
  color: #334155;
  padding: 3px 10px;
  border-radius: 5px;
  border: 1px solid #e2e8f0;
}

.meta-date {
  color: #94a3b8;
  margin-left: auto;
  font-size: 0.82rem;
}

.question {
  font-size: 1.05rem;
  font-weight: 600;
  color: #0f172a;
  line-height: 1.55;
  margin-bottom: 10px;
  display: flex;
  gap: 8px;
}

.q-prefix {
  color: #dc2626;
  font-weight: 700;
}

.detail {
  font-size: 0.88rem;
  color: #64748b;
  margin: 0 0 10px 24px;
  background: #f8fafc;
  padding: 6px 12px;
  border-radius: 6px;
}

.answer {
  font-size: 0.95rem;
  line-height: 1.72;
  color: #334155;
  background: #f8fafc;
  padding: 14px 18px;
  border-radius: 8px;
  border-left: 4px solid var(--primary);
  white-space: pre-wrap;
  word-break: break-word;
}

mark {
  background-color: var(--highlight);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}

.pagination {
  margin-top: 36px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
}

.btn {
  height: 38px;
  padding: 0 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-main);
  transition: all 0.15s;
}

.btn:hover:not(:disabled) {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.empty-box {
  text-align: center;
  padding: 64px 0;
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.98rem;
}