.edupstairs-ai-shell{max-width:980px;margin:28px auto;font-family:inherit;color:#111827}
            .edupstairs-ai-hero{position:relative;overflow:hidden;border-radius:28px;padding:34px;background:linear-gradient(135deg,#f8fafc 0%,#eef2ff 52%,#ecfeff 100%);border:1px solid rgba(148,163,184,.35);box-shadow:0 20px 60px rgba(15,23,42,.08)}
            .edupstairs-ai-kicker{display:inline-flex;align-items:center;gap:8px;margin-bottom:14px;padding:7px 12px;border-radius:999px;background:rgba(255,255,255,.72);border:1px solid rgba(148,163,184,.25);font-size:13px;font-weight:700;color:#334155}
            .edupstairs-ai-dot{width:8px;height:8px;border-radius:99px;background:#10b981;box-shadow:0 0 0 6px rgba(16,185,129,.12)}
            .edupstairs-ai-title{margin:0 0 22px;font-size:clamp(28px,5vw,52px);line-height:1.03;letter-spacing:-.045em;color:#0f172a}
            .edupstairs-ai-search-card{background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border:1px solid rgba(148,163,184,.3);border-radius:26px;padding:14px;box-shadow:0 14px 40px rgba(15,23,42,.10)}
            .edupstairs-ai-input-wrap{position:relative;display:flex;align-items:center;background:#fff;border-radius:22px;box-shadow:inset 0 0 0 1px rgba(148,163,184,.38);transition:box-shadow .16s ease}
            .edupstairs-ai-input-wrap:focus-within{box-shadow:inset 0 0 0 2px #2563eb,0 0 0 5px rgba(37,99,235,.10)}
            .edupstairs-ai-input{width:100%;min-height:62px;resize:vertical;border:0;outline:0;background:transparent;border-radius:22px;padding:19px 98px 18px 18px;font-size:17px;line-height:1.45;color:#0f172a;box-shadow:none}
            .edupstairs-ai-input::placeholder{color:#64748b}
            .edupstairs-ai-actions{position:absolute;right:10px;bottom:10px;display:flex;align-items:center;gap:8px}
            .edupstairs-ai-icon-btn{width:40px;height:40px;border:0;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;font-size:18px;line-height:1;transition:transform .15s ease,background .15s ease,opacity .15s ease}
            .edupstairs-ai-voice{background:#f1f5f9;color:#334155}
            .edupstairs-ai-voice:hover{background:#e2e8f0;transform:translateY(-1px)}
            .edupstairs-ai-voice.is-listening{background:#fee2e2;color:#b91c1c;animation:edupstairsPulse 1.1s infinite}
            .edupstairs-ai-submit{background:#111827;color:#fff;box-shadow:0 10px 22px rgba(17,24,39,.20)}
            .edupstairs-ai-submit:hover{transform:translateY(-1px);box-shadow:0 14px 26px rgba(17,24,39,.25)}
            .edupstairs-ai-submit:disabled{opacity:.62;cursor:not-allowed;transform:none}
            @keyframes edupstairsPulse{0%{box-shadow:0 0 0 0 rgba(239,68,68,.25)}70%{box-shadow:0 0 0 10px rgba(239,68,68,0)}100%{box-shadow:0 0 0 0 rgba(239,68,68,0)}}
            .edupstairs-ai-hints{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:14px}
            .edupstairs-ai-chip{border:1px solid rgba(148,163,184,.35);background:#fff;border-radius:18px;padding:13px 14px;font-size:14px;font-weight:800;color:#0f172a;cursor:pointer;text-align:left;line-height:1.35;transition:background .15s ease,border-color .15s ease,transform .15s ease,box-shadow .15s ease;box-shadow:0 8px 18px rgba(15,23,42,.04)}
            .edupstairs-ai-chip:hover{background:#f8fafc;border-color:#94a3b8;transform:translateY(-1px);box-shadow:0 12px 24px rgba(15,23,42,.08)}
            .edupstairs-ai-chip span{display:block;margin-top:5px;font-size:12px;font-weight:600;color:#64748b}
            .edupstairs-ai-note{margin:14px 4px 0;color:#64748b;font-size:13px;line-height:1.5}
            .edupstairs-ai-output{margin-top:22px;display:none}
            .edupstairs-ai-loading{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid rgba(148,163,184,.25);border-radius:22px;padding:18px;box-shadow:0 12px 32px rgba(15,23,42,.07)}
            .edupstairs-ai-spinner{width:22px;height:22px;border-radius:50%;border:3px solid #e2e8f0;border-top-color:#111827;animation:edupstairsSpin .8s linear infinite}
            @keyframes edupstairsSpin{to{transform:rotate(360deg)}}
            .edupstairs-ai-loading strong{display:block;color:#0f172a}.edupstairs-ai-loading span{color:#64748b;font-size:13px}
            .edupstairs-ai-answer-card{background:#fff;border:1px solid rgba(148,163,184,.28);border-radius:24px;padding:26px;box-shadow:0 18px 44px rgba(15,23,42,.08)}
            .edupstairs-ai-answer-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;padding-bottom:14px;border-bottom:1px solid #eef2f7}
            .edupstairs-ai-answer-label{font-size:13px;font-weight:900;letter-spacing:.02em;text-transform:uppercase;color:#2563eb}.edupstairs-ai-copy{border:1px solid #e2e8f0;background:#f8fafc;color:#334155;border-radius:999px;padding:7px 11px;font-size:12px;font-weight:800;cursor:pointer}.edupstairs-ai-copy:hover{background:#eef2ff;color:#1d4ed8;border-color:#bfdbfe}
            .edupstairs-ai-answer-body{font-size:16px;line-height:1.76;color:#1f2937}.edupstairs-ai-answer-body h2,.edupstairs-ai-answer-body h3{color:#0f172a;letter-spacing:-.02em}.edupstairs-ai-answer-body a{color:#1d4ed8;font-weight:700;text-decoration:none}.edupstairs-ai-answer-body a:hover{text-decoration:underline}
            .edupstairs-ai-chat-stream{display:flex;flex-direction:column;gap:14px}.edupstairs-ai-user-bubble{align-self:flex-end;max-width:82%;background:#111827;color:#fff;border-radius:20px 20px 4px 20px;padding:13px 16px;font-size:15px;line-height:1.5}.edupstairs-ai-followup{margin-top:14px;background:#fff;border:1px solid rgba(148,163,184,.28);border-radius:22px;padding:10px;box-shadow:0 12px 28px rgba(15,23,42,.06)}.edupstairs-ai-followup .edupstairs-ai-input{min-height:52px;font-size:15px;padding-top:14px;padding-bottom:14px}.edupstairs-ai-followup-note{margin:8px 4px 0;color:#64748b;font-size:12px}.edupstairs-ai-followup-suggestions{margin-top:14px;background:#f8fafc;border:1px solid #e2e8f0;border-radius:20px;padding:14px}.edupstairs-ai-followup-suggestions-title{font-size:13px;font-weight:900;color:#475569;text-transform:uppercase;letter-spacing:.02em;margin-bottom:10px}.edupstairs-ai-followup-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.edupstairs-ai-followup-chip{border:1px solid #e2e8f0;background:#fff;border-radius:16px;padding:11px 12px;text-align:left;cursor:pointer;font-size:13px;font-weight:800;line-height:1.35;color:#0f172a;transition:background .15s ease,border-color .15s ease,transform .15s ease}.edupstairs-ai-followup-chip:hover{background:#eef2ff;border-color:#bfdbfe;transform:translateY(-1px)}
            .edupstairs-ai-related{margin-top:18px;background:#f8fafc;border:1px solid #e2e8f0;border-radius:22px;padding:18px}.edupstairs-ai-related h3{margin:0 0 12px;color:#0f172a;font-size:18px}.edupstairs-ai-source-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.edupstairs-ai-source-card{display:block;background:#fff;border:1px solid #e5e7eb;border-radius:18px;padding:15px;text-decoration:none;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}.edupstairs-ai-source-card:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(15,23,42,.08);border-color:#bfdbfe}.edupstairs-ai-source-card strong{display:block;color:#0f172a;font-size:15px;line-height:1.35}.edupstairs-ai-source-card span{display:block;margin-top:7px;color:#64748b;font-size:13px;line-height:1.45}.edupstairs-ai-source-card em{display:block;margin-top:9px;color:#2563eb;font-size:13px;font-style:normal;font-weight:800}
            .edupstairs-ai-error{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:18px;padding:15px;font-weight:700}.edupstairs-ai-history{margin-top:16px;background:rgba(255,255,255,.72);border:1px solid rgba(148,163,184,.25);border-radius:20px;padding:14px;display:none}.edupstairs-ai-history-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px;font-weight:900;color:#475569;text-transform:uppercase;letter-spacing:.02em}.edupstairs-ai-clear-history{border:0;background:transparent;color:#64748b;font-size:12px;cursor:pointer;font-weight:700}.edupstairs-ai-clear-history:hover{color:#1d4ed8}.edupstairs-ai-history-list{display:flex;flex-direction:column;gap:8px}.edupstairs-ai-history-item{border:1px solid #e2e8f0;background:#fff;border-radius:14px;padding:10px 12px;text-align:left;cursor:pointer;color:#0f172a;font-size:14px;line-height:1.35}.edupstairs-ai-history-item:hover{background:#f8fafc;border-color:#bfdbfe}
            @media(max-width:720px){.edupstairs-ai-shell{margin:16px auto}.edupstairs-ai-hero{border-radius:20px;padding:20px}.edupstairs-ai-source-grid{grid-template-columns:1fr}.edupstairs-ai-answer-card{padding:18px;border-radius:20px}.edupstairs-ai-title{font-size:32px}.edupstairs-ai-input{font-size:16px;padding-right:94px}.edupstairs-ai-icon-btn{width:38px;height:38px}.edupstairs-ai-hints{grid-template-columns:1fr}.edupstairs-ai-chip{padding:12px 13px}.edupstairs-ai-followup-grid{grid-template-columns:1fr}}