:root{
  --primary:#7c3aed; --primary2:#a855f7; --primary-grad:linear-gradient(135deg,#7c3aed,#a855f7);
  --bg:#f7f8fb; --panel:#ffffff; --text:#1f2430; --muted:#8a90a2; --border:#eceef3;
  --ok:#16a34a; --warn:#f59e0b; --err:#ef4444; --info:#3b82f6;
}
*{box-sizing:border-box;margin:0;padding:0;font-size:13px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);font-size:13px;line-height:1.5}
/* 注意：这里不要写 transition:.15s（过渡所有属性）。否则按钮在 .btn / .btn-ghost 之间
   切换时，文字色会从紫渐变到白、底色同时反向渐变，中间约 0.15 秒文字与底色重合，
   看起来就是「点一下按钮闪一下变空白」。只过渡这些不影响可读性的属性。 */
button{font-family:inherit;cursor:pointer;border:none;border-radius:8px;padding:7px 14px;font-size:13px;transition:border-color .15s,box-shadow .15s,filter .15s,transform .15s,opacity .15s}
button:disabled{opacity:.5;cursor:not-allowed}
.btn{background:var(--primary-grad);color:#fff;font-weight:500}
.btn:hover{filter:brightness(1.05)}
.btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--border)}
.btn-ghost:hover{background:#faf5ff}
.btn-danger{background:#fff;color:var(--err);border:1px solid #fecaca}
.btn-sm{padding:4px 9px;font-size:12px}
/* 模型分类筛选按钮：选中态只加 .on，不改类名，尺寸/文字始终在同一处，不会闪 */
.mfbtn{background:#fff;color:var(--primary);border:1px solid var(--border);border-radius:8px;padding:4px 10px;font-size:12px;line-height:1.5}
.mfbtn:hover{background:#faf5ff}
.mfbtn.on{background:var(--primary-grad);color:#fff;border-color:transparent;font-weight:600;box-shadow:0 2px 8px rgba(124,58,237,.22)}
.mfbtn.on:hover{background:var(--primary-grad)}
input,textarea,select{font-family:inherit;font-size:13px;padding:8px 10px;border:1px solid var(--border);border-radius:8px;width:100%;background:#fff;color:var(--text);outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--primary)}
label{display:block;margin:10px 0 4px;color:var(--muted);font-size:12px}
a{color:var(--primary);text-decoration:none}

/* 后台左侧菜单布局 */
.layout{display:flex;min-height:100vh}
.sidebar{width:210px;flex:0 0 210px;background:#fff;border-right:1px solid var(--border);padding:20px 14px;display:flex;flex-direction:column;gap:6px;position:sticky;top:0;height:100vh}
.brand{font-weight:700;font-size:16px;background:var(--primary-grad);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:14px}
.sidebar .nav{display:flex;flex-direction:column;gap:4px;flex:1}
.sidebar .nav button{background:transparent;color:var(--muted);padding:10px 12px;text-align:left;border-radius:8px;font-size:13px}
.sidebar .nav button:hover{background:#faf5ff}
.sidebar .nav button.active{background:#f3effe;color:var(--primary);font-weight:600}
.sidebar .btn-ghost{margin-top:auto}
.content{flex:1;min-width:0}
.content .container{max-width:1080px;margin:18px auto;padding:0 16px}

/* 商家前台顶部菜单（保留原布局，避免影响 index.html） */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 18px;background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.nav{display:flex;gap:4px}
.nav button{background:transparent;color:var(--muted);padding:7px 12px}
.nav button.active{background:#f3effe;color:var(--primary);font-weight:600}
.container{max-width:1080px;margin:18px auto;padding:0 16px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:16px;margin-bottom:14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.cap{border:1px solid var(--border);border-radius:12px;padding:14px;background:#fff;display:flex;flex-direction:column;gap:6px;transition:.15s}
.cap:hover{border-color:var(--primary);box-shadow:0 4px 16px rgba(124,58,237,.08)}
.cap h4{font-size:14px}
.cap .price{color:var(--primary);font-weight:600}
.cap .desc{color:var(--muted);font-size:12px;min-height:32px}
.tag{display:inline-block;font-size:11px;padding:1px 7px;border-radius:20px;background:#f3effe;color:var(--primary)}
.tag.model{background:#eef2ff;color:#4f46e5}
.tag.custom{background:#ecfeff;color:#0891b2}
.tabs{display:flex;gap:6px;margin-bottom:14px}
.tabs button{background:#fff;border:1px solid var(--border);color:var(--muted)}
.tabs button.active{background:var(--primary-grad);color:#fff;border-color:transparent}

.modal-mask{position:fixed;inset:0;background:rgba(20,22,30,.45);display:none;align-items:center;justify-content:center;z-index:50}
.modal-mask.show{display:flex}
.modal{background:#fff;border-radius:16px;width:520px;max-width:94vw;max-height:88vh;overflow:auto;padding:20px}
.modal h3{margin-bottom:8px}
.field{margin:10px 0}
.preview{max-width:100%;max-height:280px;border-radius:10px;margin-top:8px}
.badge{font-size:11px;padding:2px 8px;border-radius:20px}
.badge.queued{background:#f1f5f9;color:#64748b}
.badge.generating{background:#fef9c3;color:#a16207}
.badge.success{background:#dcfce7;color:#15803d}
.badge.failed{background:#fee2e2;color:#b91c1c}
.row{display:flex;gap:10px;align-items:center}
.muted{color:var(--muted)}
.right{margin-left:auto}
.center{text-align:center}
.msg{font-size:12px;margin-top:8px}
.msg.err{color:var(--err)}
.msg.ok{color:var(--ok)}
.chat-box{border:1px solid var(--border);border-radius:10px;padding:10px;max-height:240px;overflow:auto;background:#fafafa}
.chat-msg{margin:6px 0;padding:7px 10px;border-radius:10px;max-width:80%}
.chat-msg.user{background:var(--primary-grad);color:#fff;margin-left:auto}
.chat-msg.assistant{background:#fff;border:1px solid var(--border)}
.switch{position:relative;width:42px;height:22px;background:#cbd5e1;border-radius:20px;transition:.2s;cursor:pointer;flex:0 0 auto}
.switch.on{background:var(--primary)}
.switch::after{content:"";position:absolute;width:18px;height:18px;background:#fff;border-radius:50%;top:2px;left:2px;transition:.2s}
.switch.on::after{left:22px}
table{width:100%;border-collapse:collapse;font-size:12px}
th,td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--border)}
th{color:var(--muted);font-weight:600}
.toast{position:fixed;top:18px;left:50%;transform:translateX(-50%);background:#1f2430;color:#fff;padding:10px 18px;border-radius:10px;z-index:100;opacity:0;transition:.25s;pointer-events:none}
.toast.show{opacity:1}
.pill{font-size:11px;padding:2px 8px;border-radius:6px;background:#f3effe;color:var(--primary);margin-right:4px}