/* ================================================================ AI（全站助教 + AI 卡片），只用设计变量，三种主题通用 */
:root { --ai: #7c5cff; --ai-2: #19b6c9; --ai-bg: #f4f0ff; }
.ai-dot { width: 28px; height: 28px; border-radius: 9px; display: inline-grid; place-items: center; color: #fff; flex: none;
  background: linear-gradient(135deg, var(--ai), var(--ai-2)); box-shadow: 0 4px 10px -4px var(--ai); }
.ai-dot svg { width: 16px; height: 16px; }
.ai-fab { position: fixed; right: 22px; bottom: 22px; z-index: 120; display: flex; align-items: center; gap: 8px; height: 48px; padding: 0 18px 0 14px;
  border-radius: 999px; border: var(--bd); background: linear-gradient(135deg, var(--ai), var(--ai-2)); color: #fff; font: 700 15px var(--font);
  box-shadow: var(--sh-1), 0 10px 26px -10px var(--ai); cursor: pointer; transition: transform .2s var(--spring); }
.ai-fab:hover { transform: translateY(-2px) scale(1.03); }
.ai-fab svg { width: 20px; height: 20px; }
.ai-drawer { position: fixed; top: 0; right: 0; bottom: 0; width: min(440px, 100vw); z-index: 140; background: var(--paper, #fff); border-left: var(--bd);
  box-shadow: -14px 0 40px -20px rgba(35, 40, 59, .45); display: flex; flex-direction: column; transform: translateX(105%); transition: transform .32s var(--ease); }
.ai-drawer.on { transform: none; visibility: visible; transition: transform .32s var(--ease); }
.ai-drawer:not(.on) { visibility: hidden; transition: transform .32s var(--ease), visibility 0s .32s; }
.ai-hd { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: var(--bd-s); background: var(--ai-bg); }
.ai-hd b { font-size: 16px; }
.ai-hd small { display: block; font-size: 12px; color: var(--text-2); }
.ai-log { flex: 1; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.ai-msg { max-width: 92%; padding: 10px 13px; border-radius: 14px; font-size: 14px; line-height: 1.75; border: var(--bd-s); background: #fff; word-break: break-word; }
.ai-msg.user { align-self: flex-end; background: var(--note-b); border-radius: 14px 14px 4px 14px; }
.ai-msg.assistant { align-self: flex-start; border-radius: 14px 14px 14px 4px; }
.ai-msg code { font-family: var(--en); background: var(--note-y); padding: 0 4px; border-radius: 4px; }
.ai-quick { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 16px 10px; }
.ai-quick button { border: 1.5px dashed var(--ai); background: #fff; color: var(--ai); border-radius: 999px; padding: 4px 10px; font-size: 12.5px; cursor: pointer; }
.ai-quick button:hover { background: var(--ai-bg); }
.ai-in { display: flex; gap: 8px; padding: 12px 16px; border-top: var(--bd-s); }
.ai-in textarea { flex: 1; resize: none; border: var(--bd-s); border-radius: 12px; padding: 8px 10px; font: 14px/1.6 var(--font); background: #fff; }
.ai-foot { font-size: 11.5px; color: var(--text-3); padding: 0 16px 12px; }
.ai-typing { display: inline-flex; gap: 4px; vertical-align: middle; }
.ai-typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--ai); animation: aiBlink 1s infinite; }
.ai-typing i:nth-child(2) { animation-delay: .15s; }
.ai-typing i:nth-child(3) { animation-delay: .3s; }
@keyframes aiBlink { 0%, 80%, 100% { opacity: .25; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-3px); } }

.ai-card { border: var(--bd); border-radius: 18px; background: #fff; box-shadow: var(--sh-1); padding: 16px 18px; position: relative; overflow: hidden; }
.ai-card::before { content: ""; position: absolute; left: 0; top: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--ai), var(--ai-2)); }
.ai-card-h { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.ai-card-h b { font-size: 16px; }
.ai-badge { font-size: 11px; font-weight: 700; color: var(--ai); background: var(--ai-bg); border-radius: 999px; padding: 2px 8px; }
.ai-meta { font-size: 12px; color: var(--text-3); }
.ai-card-f { display: flex; align-items: center; gap: 8px; margin-top: 12px; padding-top: 10px; border-top: 1.5px dashed var(--line-2); font-size: 12px; color: var(--text-3); }
.ai-idle p { font-size: 13.5px; color: var(--text-2); line-height: 1.75; margin: 0 0 10px; }
.btn.ai-go { background: linear-gradient(135deg, var(--ai), var(--ai-2)); color: #fff; border-color: var(--ink); }
.ai-loading { display: flex; flex-direction: column; gap: 10px; font-size: 13.5px; color: var(--text-2); }
.ai-loading > span { display: flex; align-items: center; gap: 10px; }
.ai-loading .sk { height: 12px; border-radius: 6px; background: linear-gradient(90deg, var(--ai-bg), #fff, var(--ai-bg)); background-size: 200% 100%; animation: aiSk 1.2s infinite linear; }
.ai-loading .s2 { width: 80%; }
.ai-loading .s3 { width: 55%; }
@keyframes aiSk { to { background-position: -200% 0; } }
.ai-err b { color: var(--red); }
.ai-err p { font-size: 13px; color: var(--text-2); margin: 6px 0 10px; }
.ai-body { font-size: 14px; line-height: 1.75; }
.ai-tr { font-size: 15.5px; font-weight: 700; background: var(--ai-bg); border-radius: 12px; padding: 10px 12px; margin-bottom: 8px; }
.ai-row { display: flex; gap: 10px; align-items: baseline; margin: 6px 0; }
.ai-k { flex: none; font-size: 12px; font-weight: 700; color: #fff; background: var(--ink); border-radius: 6px; padding: 1px 8px; }
.ai-k.soft { background: var(--note-b); color: var(--ink); max-width: 46%; }
.ai-sub { font-size: 12.5px; font-weight: 800; color: var(--ai); margin: 12px 0 6px; letter-spacing: 1px; }
.ai-note { background: var(--note-b); border-radius: 10px; padding: 8px 12px; font-size: 13.5px; margin-top: 6px; }
.ai-note.y { background: var(--note-y); }
.ai-pt { display: flex; gap: 8px; margin: 4px 0; font-size: 13.5px; }
.ai-pt b { flex: none; }
.ai-pt b::after { content: "："; }
.ai-words { display: grid; gap: 6px; }
.ai-words > div { display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap; border: 1.5px solid var(--line-2); border-radius: 10px; padding: 6px 10px; }
.ai-words small { color: var(--text-2); width: 100%; }
.ai-words i { color: var(--text-3); font-size: 12px; }
.ai-words .btn { margin-left: auto; }
.ai-ex { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 6px 0; }
.ai-ex .en { font-size: 15.5px; }
.ai-ex small { width: 100%; color: var(--text-2); }
.ai-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.ai-chips > * { border: 1.5px solid var(--line-2); border-radius: 999px; padding: 2px 10px; font-size: 13px; background: #fff; }
.ai-find { display: flex; gap: 8px; align-items: baseline; border-radius: 10px; padding: 7px 10px; margin: 6px 0; font-size: 13.5px; }
.ai-find span { flex: none; font-size: 12px; font-weight: 800; }
.ai-find.g { background: var(--note-g); }
.ai-find.p { background: var(--note-p); }
.ai-find.y { background: var(--note-y); }
.ai-plan { display: grid; gap: 6px; }
.ai-plan > div { display: flex; gap: 10px; align-items: baseline; border-left: 3px solid var(--ai); padding: 2px 10px; font-size: 13.5px; }
.ai-plan b { flex: none; min-width: 3em; }
.ai-score { display: flex; gap: 16px; align-items: center; background: var(--ai-bg); border-radius: 14px; padding: 12px 14px; }
.ai-score .n { font-size: 46px; font-weight: 800; line-height: 1; color: var(--ai); }
.ai-score .n small { font-size: 16px; color: var(--text-3); }
.ai-score p { margin: 4px 0 0; font-size: 13.5px; color: var(--text-2); }
.ai-dims { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
.ai-dims > div { border: 1.5px solid var(--line-2); border-radius: 10px; padding: 8px 10px; display: flex; flex-direction: column; gap: 2px; font-size: 13px; }
.ai-dims .stars { color: #f5a524; letter-spacing: 1px; }
.stars .off { color: var(--line-2); }
.ai-dims small { color: var(--text-2); }
.ai-fix { border: 1.5px solid var(--line-2); border-radius: 10px; padding: 7px 10px; margin: 6px 0; display: flex; flex-direction: column; gap: 2px; }
.ai-fix s { color: var(--red); font-size: 14px; }
.ai-fix span { color: #1f9d55; font-weight: 700; font-size: 14.5px; }
.ai-fix.up span { color: var(--ai); }
.ai-fix small { color: var(--text-2); font-size: 12.5px; }
.ai-quiz { display: grid; gap: 12px; }
.aq { border: 1.5px solid var(--line-2); border-radius: 12px; padding: 10px 12px; }
.aq-h { font-size: 14.5px; line-height: 1.7; }
.aq-h .tag { margin-right: 6px; }
.aq-o { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 8px; }
.aq-o button { text-align: left; border: var(--bd-s); border-radius: 10px; background: #fff; padding: 6px 10px; font-size: 14px; cursor: pointer; }
.aq-o button:hover { background: var(--note-y); }
.aq-o button.right { background: var(--note-g); }
.aq-o button.wrong { background: var(--note-p); }
.aq-x { display: none; font-size: 13px; color: var(--text-2); background: var(--note-b); border-radius: 8px; padding: 6px 10px; margin-top: 8px; }
.aq.done .aq-x { display: block; }
.ai-modal .modal { width: min(720px, 100%); }
.modal-h { display: flex; align-items: center; justify-content: space-between; }
.ai-quote { font-size: 16px; line-height: 1.8; border-left: 4px solid var(--ai); padding: 4px 12px; margin: 6px 0 14px; background: var(--ai-bg); border-radius: 0 10px 10px 0; }
.ai-feat { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.ai-feat a { display: flex; flex-direction: column; gap: 4px; border: var(--bd-s); border-radius: 14px; padding: 12px 14px; background: #fff; color: inherit; text-decoration: none; transition: transform .2s; }
.ai-feat a:hover { transform: translateY(-2px); box-shadow: var(--sh-0); }
.ai-feat a b { display: flex; align-items: center; gap: 6px; font-size: 15px; }
.ai-feat a b svg { width: 18px; height: 18px; color: var(--ai); }
.ai-feat a span { font-size: 12.5px; color: var(--text-2); line-height: 1.6; }
.ai-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.ai-hist { display: grid; gap: 6px; }
.ai-hist a { display: flex; gap: 10px; align-items: center; border: 1.5px solid var(--line-2); border-radius: 10px; padding: 7px 10px; font-size: 13.5px; color: inherit; text-decoration: none; background: #fff; }
.ai-hist a .k { flex: none; font-size: 11.5px; font-weight: 700; color: var(--ai); background: var(--ai-bg); border-radius: 6px; padding: 1px 6px; }
.ai-hist a .t { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ai-hist a time { color: var(--text-3); font-size: 12px; }
@media (max-width: 900px) {
  .ai-feat, .ai-grid { grid-template-columns: 1fr; }
  .ai-fab span { display: none; }
  .ai-fab { padding: 0 14px; }
  .aq-o, .ai-dims { grid-template-columns: 1fr; }
}