/* ===== AI 学习工具箱 (chineseclass / cn 子站) ===== */
#aiToolsSection { margin-top: 2rem; }
#aiToolsSection .section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 .25rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}
.ai-tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  transition: var(--transition);
  box-shadow: var(--shadow);
}
.ai-tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--secondary);
}
.ai-tool-icon { font-size: 2rem; line-height: 1; }
.ai-tool-name { font-weight: 700; font-size: 1.05rem; color: var(--primary); }
.ai-tool-desc { font-size: .85rem; color: var(--text-secondary); line-height: 1.5; flex: 1; }
.ai-tool-open {
  align-self: flex-start;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: .5rem 1.1rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  transition: var(--transition);
}
.ai-tool-open:hover { background: var(--primary-light); }

/* ===== Modal ===== */
.ai-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9000;
  padding: 1rem;
  backdrop-filter: blur(4px);
}
.ai-modal {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  overflow: auto;
  box-shadow: var(--shadow-lg);
  animation: aiPop .2s ease;
}
@keyframes aiPop { from { transform: scale(.96); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.ai-modal-head {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: #fff;
}
.ai-modal-icon { font-size: 1.6rem; }
.ai-modal-title { margin: 0; font-size: 1.2rem; color: var(--primary); flex: 1; }
.ai-modal-close {
  background: none; border: none; font-size: 1.7rem; line-height: 1;
  cursor: pointer; color: var(--text-light);
}
.ai-modal-close:hover { color: var(--text); }
.ai-modal-desc { padding: .6rem 1.5rem 0; color: var(--text-secondary); font-size: .9rem; margin: 0; }
.ai-modal-form { padding: 1.25rem 1.5rem; display: flex; flex-direction: column; gap: 1rem; }

.ai-field { display: flex; flex-direction: column; gap: .4rem; font-size: .9rem; color: var(--text); }
.ai-field > span i { color: #E11D48; font-style: normal; }
.ai-field input, .ai-field select, .ai-field textarea {
  padding: .6rem .75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: .95rem;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  width: 100%;
}
.ai-field textarea { resize: vertical; min-height: 96px; }
.ai-field input:focus, .ai-field select:focus, .ai-field textarea:focus {
  outline: none; border-color: var(--secondary); box-shadow: 0 0 0 3px rgba(45,181,176,.15);
}

.ai-ocr-box {
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 1rem;
  background: #F8FAFC;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.ai-btn-ocr {
  align-self: flex-start;
  background: var(--secondary);
  color: #08312f;
  border: none;
  padding: .55rem 1rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
}
.ai-btn-ocr:hover { filter: brightness(1.05); }
.ai-ocr-status { font-size: .8rem; color: var(--text-secondary); }

.ai-loading {
  display: flex; align-items: center; gap: .6rem;
  color: var(--text-secondary);
  padding: .25rem 1.5rem 1rem;
  font-size: .9rem;
}
.ai-spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--secondary);
  border-radius: 50%;
  animation: aiSpin .8s linear infinite;
}
@keyframes aiSpin { to { transform: rotate(360deg); } }

.ai-modal-result {
  margin: 0 1.5rem 1rem;
  padding: 1rem 1.25rem;
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-radius: 12px;
  line-height: 1.7;
  font-size: .95rem;
  color: var(--text);
  overflow-wrap: anywhere;
}
.ai-modal-result h4 { color: var(--primary); margin: .9rem 0 .3rem; }
.ai-modal-result h4:first-child { margin-top: 0; }
.ai-modal-result p { margin: .4rem 0; }
.ai-modal-result ul, .ai-modal-result ol { margin: .3rem 0 .3rem 1.3rem; }
.ai-modal-result li { margin: .25rem 0; }
.ai-modal-result strong { color: var(--primary); }
.ai-modal-result em { color: var(--accent); font-style: normal; font-weight: 600; }
.ai-modal-result blockquote {
  border-left: 3px solid var(--secondary);
  padding-left: .8rem;
  color: var(--text-secondary);
  margin: .5rem 0;
}
.ai-modal-result table { border-collapse: collapse; width: 100%; margin: .6rem 0; }
.ai-modal-result th, .ai-modal-result td { border: 1px solid var(--border); padding: .45rem .6rem; font-size: .85rem; text-align: left; }
.ai-modal-result code { background: #EEF2F7; padding: .1rem .35rem; border-radius: 4px; font-size: .85em; }

.ai-modal-actions {
  display: flex; justify-content: flex-end; gap: .75rem;
  padding: 1rem 1.5rem 1.5rem;
  position: sticky; bottom: 0; background: #fff;
  border-top: 1px solid var(--border);
}
.ai-btn-primary {
  background: var(--primary); color: #fff; border: none;
  padding: .65rem 1.5rem; border-radius: 10px; font-weight: 600;
  cursor: pointer; font-size: .95rem; transition: var(--transition);
}
.ai-btn-primary:hover { background: var(--primary-light); }
.ai-btn-primary:disabled { opacity: .6; cursor: wait; }
.ai-btn-secondary {
  background: #fff; color: var(--text-secondary); border: 1px solid var(--border);
  padding: .65rem 1.5rem; border-radius: 10px; cursor: pointer; font-size: .95rem;
}
.ai-btn-secondary:hover { background: #F1F5F9; }

@media (max-width: 600px) {
  .ai-tools-grid { grid-template-columns: 1fr 1fr; }
  .ai-modal-actions { flex-direction: column-reverse; }
  .ai-modal-actions button { width: 100%; }
}