/* 文星留在横幅右侧，以小形象与就近提问框陪伴学习。 */
.sc-constellation.sc-companion-hero[data-smart-agent]{height:260px;max-height:280px;min-height:0;padding:0;margin:0;display:flex;align-items:center;justify-content:center;gap:9px;isolation:isolate}
[data-smart-agent] .sc-agent-avatar{width:88px;min-width:88px;align-self:center}
[data-smart-agent] .sc-companion-art{width:100%;height:105px;max-width:100%;border-radius:0;object-fit:contain;filter:drop-shadow(0 7px 12px #2c6b9b1c);transition:transform .5s ease,width .5s ease;animation:sc-companion-float 7s ease-in-out infinite}
.sc-agent-bubble{width:254px;max-width:calc(100% - 97px);position:relative;border:1px solid #a9cef1;border-radius:13px;padding:14px 15px 11px;background:linear-gradient(130deg,#ffffffd9,transparent 65%),linear-gradient(#86b8de0c 1px,transparent 1px),linear-gradient(90deg,#86b8de0c 1px,transparent 1px),linear-gradient(145deg,#fafdfff7,#edf7fff5);background-size:auto,22px 22px,22px 22px,auto;box-shadow:inset 0 0 0 3px #ffffff80,0 8px 27px #3673ac19,0 0 16px #8fcfff14;backdrop-filter:blur(18px);text-align:left;transition:opacity .35s,transform .35s}
.sc-agent-bubble:before{content:"";position:absolute;left:-6px;top:calc(50% - 6px);width:10px;height:10px;border-left:1px solid #a9cef1;border-bottom:1px solid #a9cef1;background:#f5fbff;transform:rotate(45deg)}
.sc-agent-bubble:after{content:"";position:absolute;left:17px;right:17px;top:-1px;height:2px;background:linear-gradient(90deg,transparent,#398dea 24%,#80d8ed 62%,transparent);border-radius:2px;pointer-events:none}
.sc-agent-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px;padding-bottom:9px;border-bottom:1px solid #cbdff2;position:relative}
.sc-agent-heading:after{content:"";position:absolute;left:0;bottom:-1px;width:24px;height:2px;background:#4fafe1;box-shadow:0 0 7px #5dbeec70;animation:sc-agent-light 5s ease-in-out infinite;pointer-events:none}
.sc-agent-heading figcaption{position:static;transform:none;display:flex;align-items:center;gap:8px;line-height:1.5}
.sc-agent-heading strong{font-family:"STSong","SimSun",serif;font-size:17px;letter-spacing:2px;font-weight:600;color:#224f7a}
.sc-agent-heading figcaption span{font-size:10px;color:#6b88a6;white-space:nowrap;order:2}
.sc-agent-heading figcaption .sc-agent-ai-mark{display:inline-flex;align-items:center;justify-content:center;font:600 9px/1.3 Arial,sans-serif;letter-spacing:.5px;color:#2978ba;background:#e1f4ff;border:1px solid #abd5f2;border-radius:4px;padding:2px 3px;margin-left:-4px;order:1}
.sc-agent-heading button{display:grid;place-items:center;flex:none;width:24px;height:24px;padding:0;border:1px solid #c6def5;border-radius:7px;background:#f8fcffb3;color:#497aa8;font:17px/1 sans-serif;cursor:pointer}
.sc-agent-heading button:hover{border-color:#81b7e9;background:#e7f4ff}
.sc-agent-intro{color:#557795;font-size:11px;line-height:1.8;margin:0 0 10px}
.sc-agent-answer{font-size:11px;line-height:1.8;color:#4a6e91;margin:0 0 10px;max-height:74px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;overscroll-behavior:contain}
.sc-agent-answer[hidden],#sc-agent-chat-body[hidden]{display:none}
#sc-agent-form{display:flex;align-items:flex-end;gap:6px;background:linear-gradient(120deg,#fff,#f0f8ff);border:1px solid #bcd8f2;border-radius:9px;padding:6px 7px 6px 10px;min-width:0;box-shadow:inset 0 1px 3px #659cd012,0 1px 0 #ffffffb3;transition:border-color .2s,box-shadow .2s}
#sc-agent-form .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
#sc-agent-question{display:block;flex:1;width:0;min-width:0;resize:vertical;min-height:30px;max-height:65px;max-width:100%;padding:5px 0 2px;border:0;outline:0;background:transparent;box-shadow:none;font:12px/1.7 "Microsoft YaHei",sans-serif;color:#315a80;border-radius:0}
#sc-agent-question::placeholder{color:#7896b3}
#sc-agent-form:focus-within{border-color:#4c9be8;box-shadow:0 0 0 3px #3c98ed16,inset 0 1px 3px #659cd00c}
.sc-agent-send{display:grid;place-items:center;flex:none;width:29px;height:29px;border:1px solid #398be3;border-radius:8px;background:linear-gradient(140deg,#3489f4,#2168da);color:white;box-shadow:inset 0 1px 0 #a0d7ff80,0 3px 7px #3383d82b;cursor:pointer;margin:0 0 1px;padding:6px}
.sc-agent-send svg{width:15px;height:15px}
.sc-agent-send:hover{background:linear-gradient(140deg,#2b7eea,#185ac7)}.sc-agent-send:disabled{background:#a9c8ec;border-color:#a9c8ec;box-shadow:none;cursor:wait}
.sc-agent-full{display:flex;align-items:center;gap:5px;margin:9px 0 0 auto;padding:0;border:0;background:transparent;color:#507eaa;font:10px/1.7 "Microsoft YaHei",sans-serif;cursor:pointer}
.sc-agent-full svg{height:12px;width:12px;fill:none;stroke:currentColor;stroke-width:1.5}
.sc-agent-full:hover{color:#2c6ab8}
.sc-agent-full:focus-visible,.sc-agent-send:focus-visible,.sc-agent-heading button:focus-visible{outline:3px solid #75a9e5;outline-offset:3px}
.sc-agent-is-welcoming .sc-agent-bubble{opacity:0;transform:translateX(7px);pointer-events:none}
.sc-agent-is-welcoming .sc-companion-art{transform:scale(1.18)}
.sc-agent-on-home #yc-launcher{display:none!important}
@keyframes sc-agent-light{0%,100%{opacity:.5}50%{opacity:1}}
@media(max-width:1200px) and (min-width:901px){[data-smart-agent] .sc-agent-avatar{width:76px;min-width:76px}.sc-agent-bubble{max-width:calc(100% - 85px);padding:13px}}
@media(max-width:900px) and (min-width:651px){.sc-constellation.sc-companion-hero[data-smart-agent]{flex-direction:column;height:265px;gap:2px;justify-content:center}[data-smart-agent] .sc-agent-avatar{width:59px;min-width:59px;height:64px}[data-smart-agent] .sc-companion-art{height:64px}.sc-agent-bubble{width:230px;max-width:100%;padding:11px 13px}.sc-agent-bubble:before{left:calc(50% - 5px);top:-6px;transform:rotate(135deg)}.sc-agent-heading{margin-bottom:7px}.sc-agent-intro{margin-bottom:7px}}
@media(max-width:650px){.sc-hero-inner{display:block!important;min-height:0;padding:20px 20px 16px}.sc-hero{min-height:0}.sc-motivation-copy h1{font-size:27px;line-height:1.5;margin-bottom:8px;white-space:normal;text-wrap:balance}.sc-motivation-copy .sc-hero-subtitle{font-size:12px;line-height:1.9;max-width:100%}.sc-motivation-copy .sc-hero-kicker{font-size:9px;margin-bottom:9px}.sc-motivation-copy .sc-hero-actions{margin-top:12px;flex-wrap:nowrap}.sc-constellation.sc-companion-hero[data-smart-agent]{width:100%;max-width:370px;max-height:none;height:auto;margin:13px 0 0 auto;gap:9px;justify-content:flex-end}[data-smart-agent] .sc-agent-avatar{width:62px;min-width:62px}[data-smart-agent] .sc-companion-art{height:76px}.sc-agent-bubble{width:259px;max-width:calc(100% - 71px);padding:11px 13px 9px;border-radius:14px}.sc-agent-heading{margin-bottom:6px}.sc-agent-heading strong{font-size:14px}.sc-agent-heading figcaption span{font-size:9px}.sc-agent-intro{font-size:10px;margin-bottom:7px}.sc-agent-answer{font-size:10px;max-height:60px;margin-bottom:7px}#sc-agent-question{font-size:10px;min-height:27px}.sc-agent-send{height:25px;width:25px}.sc-agent-full{font-size:9px;margin-top:6px}.sc-home-courses .sc-section-heading{margin-bottom:10px}}
@media(max-width:380px){.sc-motivation-copy h1{font-size:24px}.sc-motivation-copy .sc-hero-subtitle{font-size:11px}.sc-agent-bubble{padding:10px;max-width:calc(100% - 62px)}[data-smart-agent] .sc-agent-avatar{width:53px;min-width:53px}}
@media(prefers-reduced-motion:reduce){[data-smart-agent] .sc-companion-art,.sc-agent-bubble{animation:none!important;transition:none!important}.sc-agent-is-welcoming .sc-companion-art{transform:none}}

/* 文星朝向正文，首页适度放大，文字与提问框保持正常方向。 */
.sc-home [data-smart-agent] .sc-agent-avatar{width:118px;min-width:118px}
.sc-home [data-smart-agent] .sc-companion-art{height:140px;scale:-1 1}
.sc-home .sc-agent-bubble{max-width:calc(100% - 127px)}
@media(max-width:1200px) and (min-width:901px){.sc-home [data-smart-agent] .sc-agent-avatar{width:100px;min-width:100px}.sc-home [data-smart-agent] .sc-companion-art{height:121px}.sc-home .sc-agent-bubble{max-width:calc(100% - 109px)}}
@media(max-width:900px) and (min-width:651px){.sc-home .sc-constellation.sc-companion-hero[data-smart-agent]{height:280px}.sc-home [data-smart-agent] .sc-agent-avatar{width:80px;min-width:80px;height:86px}.sc-home [data-smart-agent] .sc-companion-art{height:86px}.sc-home .sc-agent-bubble{max-width:100%}}
@media(max-width:650px){.sc-home [data-smart-agent] .sc-agent-avatar{width:83px;min-width:83px}.sc-home [data-smart-agent] .sc-companion-art{height:100px}.sc-home .sc-agent-bubble{max-width:calc(100% - 92px)}}
@media(max-width:380px){.sc-home [data-smart-agent] .sc-agent-avatar{width:71px;min-width:71px}.sc-home [data-smart-agent] .sc-companion-art{height:86px}.sc-home .sc-agent-bubble{max-width:calc(100% - 80px)}}
@media(max-width:650px){.sc-agent-heading strong{font-size:16px}.sc-agent-intro{font-size:11px}#sc-agent-question{font-size:12px;min-height:30px}.sc-agent-send{height:28px;width:28px}.sc-agent-full{font-size:10px}}
@media(prefers-reduced-motion:reduce){.sc-agent-heading:after{animation:none!important}}