/* 调色板：品牌蓝 #1D4ED8–#3B82F6 | CTA 绿 | 浅灰白底 | 深灰黑字 */
:root {
  --brand-deep: #1d4ed8;
  --brand-mid: #2563eb;
  --brand-light: #3b82f6;
  --cta-green: #22c55e;
  --cta-green-hover: #16a34a;
  --bg-page: #f3f4f6;
  --bg-card: #ffffff;
  --bg-input: #f9fafb;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --border-focus: #3b82f6;
  --ok: #059669;
  --warn: #d97706;
  --radius: 12px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-card: 0 4px 24px rgba(29, 78, 216, 0.08);
}

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

body {
  font-family: var(--font);
  background: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, var(--brand-deep) 0%, var(--brand-mid) 45%, var(--brand-light) 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(29, 78, 216, 0.25);
}

.brand { display: flex; gap: 1rem; align-items: center; }
.logo { font-size: 2rem; filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.15)); }
.brand h1 { font-size: 1.35rem; font-weight: 600; color: #ffffff; }
.brand p { color: rgba(255, 255, 255, 0.88); font-size: 0.85rem; }

.tabs {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 2rem;
  flex-wrap: wrap;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.tab {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.tab:hover {
  color: var(--brand-deep);
  border-color: var(--brand-light);
  background: #eff6ff;
}

.tab.active {
  background: linear-gradient(135deg, var(--brand-deep), var(--brand-light));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 2px 8px rgba(29, 78, 216, 0.35);
}

.panels { max-width: 960px; margin: 0 auto; padding: 1.5rem 1.5rem 3rem; }
.panel { display: none; }
.panel.active { display: block; animation: fade 0.25s ease; }

@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.card h2 { margin-bottom: 0.5rem; font-size: 1.2rem; color: var(--text-primary); }
.hint { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1rem; }

.meta-tag {
  font-size: 0.85rem;
  color: var(--brand-deep);
  margin-bottom: 0.5rem;
}

.resource-box {
  margin-top: 0.75rem;
  padding: 0.6rem 0.75rem;
  background: #eff6ff;
  border-left: 3px solid var(--brand-light);
  border-radius: 0 6px 6px 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

label { display: block; margin-bottom: 0.75rem; font-size: 0.9rem; color: var(--text-secondary); }
input, select, textarea {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.6rem 0.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.check { display: flex; align-items: center; gap: 0.5rem; color: var(--text-secondary); }
.check input { width: auto; margin: 0; }

.btn {
  border: none;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 0.5rem;
  margin-right: 0.5rem;
  transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
}

/* 主操作 / CTA：亮绿色 */
.btn.primary {
  background: var(--cta-green);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(34, 197, 94, 0.35);
}

.btn.primary:hover {
  background: var(--cta-green-hover);
  box-shadow: 0 4px 14px rgba(34, 197, 94, 0.45);
  transform: translateY(-1px);
}

.btn.secondary {
  background: var(--bg-card);
  color: var(--brand-deep);
  border: 1px solid var(--brand-light);
}

.btn.secondary:hover {
  background: #eff6ff;
  border-color: var(--brand-deep);
}

.example-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.btn.example {
  background: #eff6ff;
  color: var(--brand-deep);
  border: 1px dashed var(--brand-light);
  font-size: 0.88rem;
  padding: 0.45rem 0.85rem;
}

.btn.example:hover {
  background: #dbeafe;
  border-color: var(--brand-deep);
}

.grid-2 .example-bar.span-2 {
  grid-column: span 2;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.span-2 { grid-column: span 2; }

.row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-end; margin-bottom: 1rem; }
.row label { flex: 1; min-width: 140px; }

.reply, .report {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  white-space: pre-wrap;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.qa-chat {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fafbfc;
  overflow: hidden;
}

.qa-thread {
  max-height: 420px;
  overflow-y: auto;
  padding: 1rem 1rem 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.qa-chapter-pill {
  align-self: center;
  font-size: 0.8rem;
  color: var(--brand-deep);
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
}

.qa-row {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
}

.qa-row.is-user {
  flex-direction: row-reverse;
}

.qa-avatar {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
}

.qa-row.is-assistant .qa-avatar {
  background: linear-gradient(135deg, var(--brand-deep), var(--brand-light));
}

.qa-row.is-user .qa-avatar {
  background: #6b7280;
}

.qa-bubble-wrap {
  max-width: 88%;
  min-width: 0;
}

.qa-row.is-user .qa-bubble-wrap {
  text-align: right;
}

.qa-name {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.qa-bubble {
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-primary);
  text-align: left;
}

.qa-row.is-assistant .qa-bubble {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-top-left-radius: 4px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.qa-row.is-user .qa-bubble {
  background: #dcfce7;
  border: 1px solid #bbf7d0;
  border-top-right-radius: 4px;
  color: #14532d;
}

.qa-bubble p {
  margin: 0 0 0.5rem;
}

.qa-bubble p:last-child {
  margin-bottom: 0;
}

.qa-direct-answer {
  margin-bottom: 0.75rem;
  padding: 0.75rem 0.85rem;
  background: #ecfdf5;
  border-left: 3px solid var(--cta-green);
  border-radius: 0 8px 8px 0;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.qa-feedback {
  margin-bottom: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed #e5e7eb;
}

.qa-answer-key {
  margin: 0.5rem 0;
  padding: 0.65rem 0.75rem;
  background: #fffbeb;
  border-left: 3px solid #f59e0b;
  border-radius: 0 6px 6px 0;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.qa-answer-key::before {
  content: "解答要点";
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #b45309;
  margin-bottom: 0.25rem;
}

.qa-guide-callout {
  margin-top: 0.65rem;
  padding: 0.55rem 0.7rem;
  background: #f0fdf4;
  border-left: 3px solid var(--cta-green);
  border-radius: 0 6px 6px 0;
  font-size: 0.9rem;
}

.qa-guide-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--cta-green-hover);
  margin-right: 0.35rem;
}

.qa-thread-footer {
  margin: 0.25rem 0 0;
  padding: 0.65rem 0.85rem;
  background: #fff;
  border-top: 1px dashed var(--border);
  font-size: 0.82rem;
}

.qa-foot-block + .qa-foot-block {
  margin-top: 0.5rem;
}

.qa-foot-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-right: 0.5rem;
  vertical-align: top;
}

.qa-chips {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.qa-chip {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  background: #eff6ff;
  color: var(--brand-deep);
  border-radius: 4px;
  font-size: 0.78rem;
}

.qa-link-list {
  margin: 0.25rem 0 0;
  padding-left: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.qa-link-list li {
  margin-bottom: 0.25rem;
}

.qa-composer {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  padding: 0.75rem;
  background: #fff;
  border-top: 1px solid var(--border);
}

.qa-composer textarea {
  flex: 1;
  margin: 0;
  min-height: 2.5rem;
  resize: vertical;
}

.qa-composer .btn {
  margin: 0;
  flex-shrink: 0;
  white-space: nowrap;
}

.report { font-family: ui-monospace, monospace; font-size: 0.85rem; max-height: 420px; overflow: auto; }

.hidden { display: none !important; }

.layer-card {
  border-left: 4px solid var(--brand-light);
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
  background: var(--bg-input);
  border-radius: 0 8px 8px 0;
}

.layer-card h4 { color: var(--brand-deep); margin-bottom: 0.35rem; }

.quiz .q-item {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.score-bar {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: linear-gradient(90deg, #eff6ff, #f9fafb);
  border-radius: 8px;
  border-left: 4px solid var(--brand-light);
  color: var(--text-primary);
}

.score-bar strong { font-size: 1.2rem; color: var(--brand-deep); }

.quiz-review {
  margin-top: 1rem;
  max-height: 520px;
  overflow-y: auto;
}

.quiz-review h3 { margin-bottom: 0.75rem; font-size: 1.05rem; color: var(--text-primary); }

.review-item {
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--bg-input);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.review-item h4 { margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.5rem; color: var(--text-primary); }

.tag {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
}

.tag.ok { background: #d1fae5; color: var(--ok); }
.tag.bad { background: #fef3c7; color: var(--warn); }

.review-item .explain {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border);
  color: var(--text-muted);
  line-height: 1.65;
}

.loading-toast {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%);
  z-index: 9999;
  padding: 0.85rem 1.1rem 0.95rem;
  background: var(--bg-card);
  border: 1px solid var(--brand-light);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(29, 78, 216, 0.15);
  color: var(--text-primary);
  font-size: 0.92rem;
  width: min(92vw, 440px);
  max-width: min(92vw, 440px);
}

.loading-toast-inner {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.loading-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.loading-progress-wrap {
  height: 6px;
  border-radius: 999px;
  background: #e5e7eb;
  overflow: hidden;
}

.loading-progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand-deep), var(--brand-light));
  transition: width 0.12s ease-out;
}

.loading-elapsed {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.loading-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid #e5e7eb;
  border-top-color: var(--brand-light);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

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

body.is-loading .btn.primary,
body.is-loading .btn.secondary {
  opacity: 0.65;
  pointer-events: none;
}

.loading-inline {
  margin-top: 0.75rem;
  padding: 0.65rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.loading-inline .loading-spinner {
  width: 14px;
  height: 14px;
}

.loading-inline-top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.loading-inline .loading-progress-wrap {
  height: 4px;
}

.loading-progress-wrap.indeterminate {
  position: relative;
}

.loading-progress-indeterminate {
  position: absolute;
  top: 0;
  left: -42%;
  width: 42%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand-deep), var(--brand-light));
  animation: loading-indeterminate 1.1s ease-in-out infinite;
}

@keyframes loading-indeterminate {
  0% { left: -42%; }
  100% { left: 100%; }
}

.qa-stream-raw {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.65;
}

.stream-caret {
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--brand-mid);
  animation: stream-blink 0.9s step-end infinite;
}

@keyframes stream-blink {
  50% { opacity: 0; }
}

.stream-preview {
  white-space: pre-wrap;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
  .span-2 { grid-column: span 1; }
  .header { flex-direction: column; align-items: flex-start; gap: 1rem; }
}

/* shadcn 风格 Toast / Alert Dialog */
.ui-toast-host {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: min(420px, calc(100vw - 2rem));
  pointer-events: none;
}

.ui-toast {
  pointer-events: auto;
  padding: 1rem 1.125rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: 0 10px 38px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.08);
  opacity: 0;
  transform: translateY(0.5rem);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.ui-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.ui-toast-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.ui-toast-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.ui-toast--destructive {
  border-color: #fecaca;
  background: #fef2f2;
}

.ui-toast--destructive .ui-toast-title,
.ui-toast--destructive .ui-toast-desc {
  color: #991b1b;
}

.ui-toast--warning {
  border-color: #fde68a;
  background: #fffbeb;
}

.ui-toast--warning .ui-toast-title,
.ui-toast--warning .ui-toast-desc {
  color: #92400e;
}

.ui-toast--success {
  border-color: #bbf7d0;
  background: #f0fdf4;
}

.ui-toast--success .ui-toast-title,
.ui-toast--success .ui-toast-desc {
  color: #166534;
}

.ui-dialog-root {
  position: fixed;
  inset: 0;
  z-index: 10001;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.ui-dialog-root.hidden {
  display: none;
}

.ui-dialog-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}

.ui-dialog-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 28rem;
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.18);
  animation: ui-dialog-in 0.18s ease-out;
}

@keyframes ui-dialog-in {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(4px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.ui-dialog-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.ui-dialog-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.ui-dialog-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

.ui-dialog-confirm {
  min-width: 5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--brand-mid);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease;
}

.ui-dialog-confirm:hover {
  background: var(--brand-deep);
}

.ui-dialog-confirm:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}