:root{
  --bg:#0f1117;--panel:#161a24;--panel2:#1d2230;--line:#252b3a;
  --text:#e6e9f0;--muted:#8b93a7;--primary:#6366f1;--primary2:#818cf8;
  --user:#1e293b;--bot:#1b2233;--ok:#22c55e;--warn:#f59e0b;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);height:100vh;overflow:hidden}
#app{display:flex;height:100vh}
button{cursor:pointer;font-family:inherit;border:none;outline:none}
textarea,input,select{font-family:inherit;background:var(--panel2);border:1px solid var(--line);
  color:var(--text);border-radius:10px;padding:10px 12px;font-size:14px;outline:none;width:100%}
textarea:focus,input:focus,select:focus{border-color:var(--primary)}
.block{width:100%;display:block}
.btn-primary{background:linear-gradient(135deg,var(--primary),#7c3aed);color:#fff;border-radius:10px;
  padding:10px 18px;font-size:14px;font-weight:600;transition:.15s}
.btn-primary:hover{opacity:.9}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:10px 18px;font-size:14px}
.btn-ghost:hover{background:var(--panel2)}
.btn-pill{background:var(--panel2);border:1px solid var(--line);color:var(--text);border-radius:20px;padding:8px 16px;font-size:13px}
.btn-pill:hover{border-color:var(--primary)}
.link{background:none;color:var(--muted);font-size:12px;padding:2px}

/* sidebar */
.sidebar{width:260px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:14px}
.brand{font-size:17px;font-weight:700;margin-bottom:14px;letter-spacing:.5px}
.conv-list{flex:1;overflow-y:auto;margin-top:12px;display:flex;flex-direction:column;gap:4px}
.conv-item{padding:10px 12px;border-radius:10px;font-size:13px;color:var(--muted);cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-item:hover{background:var(--panel2);color:var(--text)}
.conv-item.active{background:var(--panel2);color:var(--text)}
.conv-item .del{opacity:0;font-size:12px;color:#ef4444}
.conv-item:hover .del{opacity:1}
.sidebar-foot{border-top:1px solid var(--line);padding-top:12px;margin-top:8px}
.user-box{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.u-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#7c3aed);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.u-info{flex:1;font-size:13px;overflow:hidden}
.u-credits{font-size:12px;color:var(--muted);margin-top:2px}
.vip{background:#f59e0b;color:#000;font-size:10px;padding:1px 5px;border-radius:6px;margin-left:4px}

/* main */
.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{height:56px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 18px}
.tabs{display:flex;gap:6px}
.tab{background:none;color:var(--muted);padding:8px 14px;border-radius:8px;font-size:14px}
.tab:hover{color:var(--text)}
.tab.active{background:var(--panel2);color:var(--text)}
.panel{flex:1;display:none;flex-direction:column;overflow:hidden}
.panel.active{display:flex}

/* chat */
.messages{flex:1;overflow-y:auto;padding:22px;display:flex;flex-direction:column;gap:16px}
.msg{max-width:80%;padding:12px 16px;border-radius:14px;font-size:14px;line-height:1.65;white-space:pre-wrap;word-break:break-word}
.msg.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:var(--bot);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg.bot img,.msg.user img{max-width:320px;border-radius:10px;margin-top:6px;display:block}
.msg .meta{font-size:11px;color:var(--muted);margin-top:8px}
.typing::after{content:"▋";animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.composer{display:flex;gap:10px;padding:14px 18px;border-top:1px solid var(--line);align-items:flex-end}
.composer textarea{resize:none;max-height:160px;min-height:44px}
.composer .btn-primary{height:44px;flex-shrink:0}
.empty-chat{color:var(--muted);text-align:center;margin:auto;font-size:14px;line-height:2}

/* tools */
.tool-body{flex:1;display:flex;gap:20px;padding:22px;overflow:hidden}
.tool-result{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:14px;
  display:flex;align-items:center;justify-content:center;overflow:auto;padding:16px;min-width:0}
.tool-result img{max-width:100%;max-height:100%;border-radius:10px}
.placeholder{color:var(--muted);font-size:14px}
.tool-form{width:340px;flex-shrink:0;display:flex;flex-direction:column;gap:10px}
.tool-form label{font-size:13px;color:var(--muted);margin-top:4px}
.tool-form select{cursor:pointer}

/* modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:100}
.modal[hidden]{display:none}
.modal-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px;width:380px;max-width:92vw}
.modal-card.wide{width:640px}
.modal-tabs{display:flex;align-items:center;gap:16px;margin-bottom:18px;font-size:15px;font-weight:600}
.modal-tabs .close{margin-left:auto;cursor:pointer;color:var(--muted);font-weight:400}
.mtab{background:none;color:var(--muted);font-size:15px;padding-bottom:4px}
.mtab.active{color:var(--text);border-bottom:2px solid var(--primary)}
.auth-form{display:flex;flex-direction:column;gap:12px}
.row{display:flex;gap:8px}
.row input{flex:1}
.row .btn-ghost{flex-shrink:0;white-space:nowrap}
.plans{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}
.plan{border:1px solid var(--line);border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:8px;position:relative;background:var(--panel2)}
.plan.hot{border-color:var(--primary)}
.plan .hot-tag{position:absolute;top:-10px;right:10px;background:var(--primary);color:#fff;font-size:11px;padding:2px 8px;border-radius:8px}
.plan .pname{font-weight:700;font-size:15px}
.plan .pdesc{font-size:12px;color:var(--muted);min-height:32px}
.plan .price{font-size:22px;font-weight:800;color:var(--primary2)}
.plan .price small{font-size:12px;color:var(--muted);font-weight:400}
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:#222;color:#fff;
  padding:12px 22px;border-radius:10px;font-size:14px;z-index:200;box-shadow:0 6px 24px rgba(0,0,0,.4)}
.toast[hidden]{display:none}
.spin{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;
  border-radius:50%;animation:sp .7s linear infinite;vertical-align:-2px}
@keyframes sp{to{transform:rotate(360deg)}}
@media(max-width:760px){.sidebar{display:none}.tool-body{flex-direction:column}.tool-form{width:100%}}

/* 支付方式选择 & 后台入口 */
.paytype-bar{display:flex;align-items:center;gap:16px;font-size:14px;color:var(--muted);margin-bottom:6px;flex-wrap:wrap}
.paytype-bar label{display:flex;align-items:center;gap:5px;cursor:pointer;color:var(--text)}
.paytype-bar input{accent-color:var(--primary)}
.admin-link{display:block;text-align:center;font-size:12px;color:var(--muted);margin-top:12px;text-decoration:none;opacity:.75}
.admin-link:hover{opacity:1;color:var(--text)}