/* 成电 E 学伴：右下角悬浮入口 + 右侧对话抽屉，发送后复制问题并打开超级学习智能体。样式自包含，可在任意页面复用。 */
.floating-assistant{position:fixed;right:26px;bottom:24px;z-index:160;display:flex;flex-direction:column;align-items:center;border:0;border-radius:20px;padding:4px;background:none;color:#0a4da1;cursor:pointer;transition:transform .2s}
.floating-assistant:hover{transform:translateY(-4px)}
.floating-assistant:focus-visible{outline:3px solid #26a5e9;outline-offset:4px}
.floating-assistant img{display:block;filter:drop-shadow(0 8px 14px #0a365833)}
.floating-caption{font-size:11px;font-weight:700;line-height:1.6;text-shadow:0 0 4px #fff,0 0 8px #fff}
/* 深色背景页面：浅色文字 + 深色投影 */
.floating-assistant.on-dark{color:#e8f4ff}
.floating-assistant.on-dark img{filter:drop-shadow(0 8px 16px #00000059)}
.floating-assistant.on-dark .floating-caption{text-shadow:0 1px 6px #000000a6}
.floating-label{position:absolute;right:calc(100% + 12px);top:33px;background:#fff;border:1px solid #e2eaf2;padding:10px 13px;white-space:nowrap;border-radius:12px;box-shadow:0 6px 20px #143c5e12;font-size:12px;color:#56718b;opacity:0;transform:translateX(5px);transition:opacity .2s,transform .2s;pointer-events:none}
.floating-assistant:is(:hover,:focus-visible) .floating-label{opacity:1;transform:none}
body.assistant-open{overflow:hidden}

/* 抽屉：顶部标题栏 / 对话区（欢迎语置顶，新消息依次向下）/ 推荐提问 / 底部输入框 */
.assistant-drawer{position:fixed;inset:0 0 0 auto;margin:0;width:440px;max-width:100vw;height:100dvh;max-height:none;padding:0;border:0;background:#f5f8fc;color:#142d46;box-shadow:-20px 0 70px #00172e33;overflow:hidden}
.assistant-drawer[open]{display:flex;animation:e-drawer-in .25s ease-out}
.assistant-drawer::backdrop{background:#03142666;backdrop-filter:blur(3px)}
.assistant-drawer :is(button,textarea){font:inherit}
.assistant-drawer button{cursor:pointer}
.assistant-drawer :is(button,a):focus-visible{outline:3px solid #26a5e9;outline-offset:2px}
.assistant-panel{width:100%;height:100%;display:flex;flex-direction:column}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.drawer-header{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid #e2eaf2;background:#fff;flex-shrink:0}
.drawer-header h2{margin:0;font-size:18px;line-height:1.4}
.drawer-header p{margin:2px 0 0;font-size:11px;color:#728398}
.drawer-subtitle-link{color:#3a7bbf;text-decoration:none;border-radius:4px}
.drawer-subtitle-link:hover{color:#0a4da1;text-decoration:underline}
.drawer-tools{margin-left:auto;display:flex;align-items:center;gap:6px}
.drawer-tool{width:34px;height:34px;border:0;border-radius:10px;background:transparent;color:#6f8397;display:grid;place-items:center;text-decoration:none;transition:background .2s,color .2s}
.drawer-tool:hover{background:#eef4fa;color:#0a4da1}
.drawer-tool[hidden]{display:none}
.drawer-close{background:#f1f5f9;font-size:24px;line-height:1}

.drawer-conversation{flex:1;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding:20px}
.assistant-message{align-self:flex-start;max-width:100%;border:1px solid #dce9f5;background:#fff;border-radius:4px 16px 16px 16px;padding:14px 16px;font-size:13px;line-height:1.85;color:#526f89;box-shadow:0 3px 12px #123e6605}
.assistant-message p{margin:0}
.message-label{display:block;color:#0a4da1;font-size:11px;font-weight:700;margin-bottom:6px}
.message-action{display:inline-flex;align-items:center;gap:6px;margin-top:8px;font-size:12px;font-weight:650;color:#1777cd;text-decoration:none}
.message-action:hover{color:#0a4da1;text-decoration:underline}
.user-message{align-self:flex-end;max-width:85%;background:#1777cd;color:#fff;border-radius:16px 4px 16px 16px;padding:10px 14px;font-size:13px;line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere}
.drawer-prompts{flex-shrink:0;padding:6px 20px 14px}
.prompt-label{font-size:11px;color:#91a2b4;margin:0 0 8px}
.drawer-suggestions{display:grid;gap:8px}
.drawer-suggestions button{border:1px solid #dce6f0;background:#fff;color:#4d6c89;border-radius:10px;padding:10px 12px;text-align:left;font-size:12px;line-height:1.55;transition:background .2s,border-color .2s,color .2s}
.drawer-suggestions button:hover{background:#ebf5ff;border-color:#a3ccee;color:#0a4da1}

.drawer-form{margin:0;padding:14px 20px 18px;background:#fff;border-top:1px solid #e2eaf2;flex-shrink:0}
.drawer-composer{display:flex;align-items:flex-end;gap:10px;border:1px solid #d7e3ee;border-radius:14px;background:#fbfdff;padding:7px 7px 7px 14px;transition:border-color .2s,box-shadow .2s,background .2s}
.drawer-composer:focus-within{border-color:#54a5df;box-shadow:0 0 0 3px #126fc41a;background:#fff}
.drawer-composer textarea{flex:1;min-width:0;display:block;height:40px;max-height:160px;resize:none;border:0;outline:none;background:transparent;padding:9px 0;font-size:13px;line-height:1.7;color:#142d46}
.drawer-composer textarea::placeholder{color:#9aaabd}
.drawer-send{flex-shrink:0;width:40px;height:40px;border:0;border-radius:11px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,#208bdb,#0a58b0);box-shadow:0 5px 14px #126fc433;transition:transform .2s,box-shadow .2s}
.drawer-send:hover{transform:translateY(-1px);box-shadow:0 8px 18px #126fc447}
.copy-helper{position:fixed;top:0;left:0;width:1px;height:1px;opacity:0;pointer-events:none}

@keyframes e-drawer-in{from{transform:translateX(100%)}to{transform:translateX(0)}}
@media(max-width:680px){
  .floating-assistant{right:16px;bottom:16px}
  .floating-assistant img{width:58px;height:58px}
  .drawer-header{padding:16px}
  .drawer-conversation{padding:18px 16px}
  .drawer-prompts{padding:4px 16px 12px}
  .drawer-form{padding:12px 16px 16px}
}
@media(prefers-reduced-motion:reduce){.floating-assistant,.drawer-send,.drawer-composer{transition:none}.assistant-drawer[open]{animation:none}}