* { box-sizing: border-box; margin: 0; padding: 0; }
:root { --bg:#f4f6f9; --card:#fff; --primary:#4a90e2; --primary-soft:#e8f1fc; --text:#2c3e50; --text-sub:#7b8a99; --border:#eef1f5; --shadow:0 2px 12px rgba(0,0,0,.06); --radius:16px;
  --wx:#07C160; --wx-soft:#e8f8ef; --ali:#1677FF; --ali-soft:#e8f1fe; --qq:#12B7F5; --qq-soft:#e7f7fe; --up:#E60012; --up-soft:#fdecec; }
body { font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif; background:var(--bg); color:var(--text); min-height:100vh; padding:24px; }
.app { max-width:1440px; margin:0 auto; }
.card { background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:26px; }
.header { display:flex; align-items:center; justify-content:space-between; margin-bottom:14px; }
.header h1 { font-size:22px; font-weight:600; }
.back { font-size:13px; color:var(--text-sub); text-decoration:none; padding:6px 12px; background:var(--bg); border-radius:8px; }
.back:hover { background:var(--primary-soft); color:var(--primary); }
.desc { font-size:14px; color:var(--text-sub); line-height:1.8; margin-bottom:20px; }

/* 三个渠道卡片 */
.card-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-bottom:16px; }
.pay-card { display:flex; flex-direction:column; }
.card-head { font-size:15px; font-weight:600; padding-bottom:12px; margin-bottom:14px; border-bottom:1px solid var(--border); }
.card-head.wx { color:var(--wx); }
.card-head.ali { color:var(--ali); }
.card-head.qq { color:var(--qq); }
.card-head.up { color:var(--up); }
.opt-tag { font-size:11px; font-style:normal; font-weight:400; color:var(--text-sub); background:var(--bg); border-radius:6px; padding:2px 6px; margin-left:4px; vertical-align:2px; }

/* 上传区 */
.upload { border:2px dashed var(--border); border-radius:12px; background:var(--bg); padding:18px 12px; text-align:center; cursor:pointer; transition:border-color .2s, background .2s; margin-bottom:12px; }
.upload:hover, .upload.drag { border-color:var(--primary); background:var(--primary-soft); }
.up-icon { font-size:26px; }
.up-text { font-size:13px; color:var(--text); margin-top:6px; }
.up-sub { font-size:12px; color:var(--text-sub); margin-top:2px; }

label { display:block; font-size:13px; color:var(--text-sub); margin-bottom:6px; }
textarea { width:100%; min-height:76px; padding:10px 12px; border:1px solid var(--border); border-radius:10px; font-size:13px; font-family:Consolas,monospace; resize:vertical; word-break:break-all; }
textarea:focus { outline:none; border-color:var(--primary); }

/* 状态提示 */
.status { font-size:12px; margin-top:8px; min-height:18px; line-height:1.5; }
.status.ok { color:var(--wx); }
.status.err { color:#e5484d; }
.status.hint { color:var(--text-sub); }

/* 操作条 */
.action-bar, .poster-bar { display:flex; align-items:center; gap:14px; flex-wrap:wrap; margin-bottom:16px; }
.opt-inline { display:flex; align-items:center; gap:8px; }
.lbl { margin:0; }
select { padding:9px 12px; border:1px solid var(--border); border-radius:10px; font-size:14px; background:#fff; color:var(--text); }
select:focus { outline:none; border-color:var(--primary); }
.text-in { padding:9px 12px; border:1px solid var(--border); border-radius:10px; font-size:14px; width:170px; color:var(--text); }
.text-in:focus { outline:none; border-color:var(--primary); }
.bg-name { font-size:12px; color:var(--text-sub); max-width:130px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.btn { padding:10px 22px; border:none; border-radius:10px; font-size:14px; cursor:pointer; background:var(--primary); color:#fff; }
.btn:hover { opacity:.88; }
.btn.primary { background:var(--wx); }
.btn.ghost { background:var(--bg); color:var(--text-sub); }
.btn.ghost:hover { background:var(--primary-soft); color:var(--primary); }

/* 结果 */
.result-card h2 { font-size:17px; font-weight:600; margin-bottom:18px; }
.result-wrap { display:flex; gap:26px; align-items:flex-start; }
.qr-side { flex-shrink:0; text-align:center; }
.qr-frame { display:inline-block; padding:12px; background:#fff; border:1px solid var(--border); border-radius:14px; box-shadow:var(--shadow); }
.qr-frame canvas { display:block; width:240px; height:240px; }
.poster-frame { padding:8px; }
.poster-frame canvas { width:220px; height:auto; border-radius:8px; }
.qr-btns { display:flex; gap:10px; margin-top:14px; justify-content:center; }
.link-side { flex:1; min-width:0; }
.link-side textarea { min-height:88px; font-size:12px; }
.tips { margin-top:14px; background:var(--bg); border-radius:10px; padding:14px 16px; font-size:13px; line-height:1.9; }
.tips p { font-weight:600; margin-bottom:4px; }
.tips ol { padding-left:18px; color:var(--text); }
.tips li { margin:2px 0; }

/* 帮助 */
.help-card { margin-top:16px; }
.help-card h2 { font-size:16px; font-weight:600; margin-bottom:12px; }
.help-list { padding-left:20px; font-size:14px; line-height:2; }
.help-list code { background:var(--bg); padding:2px 6px; border-radius:6px; font-size:12px; }
.note { margin-top:12px; font-size:13px; color:var(--text-sub); line-height:1.8; background:var(--bg); border-radius:10px; padding:12px 14px; }

/* Toast */
.toast { position:fixed; bottom:30px; left:50%; transform:translateX(-50%) translateY(20px); background:var(--text); color:#fff; padding:10px 20px; border-radius:10px; font-size:13px; opacity:0; transition:all .3s; pointer-events:none; z-index:99; }
.toast.show { opacity:1; transform:translateX(-50%) translateY(0); }

/* 响应式 */
@media (max-width:1200px) { .card-grid { grid-template-columns:repeat(2,1fr); } }
@media (max-width:900px) { .card-grid { grid-template-columns:1fr; } }
@media (max-width:640px) {
  body { padding:14px; }
  .card { padding:18px; }
  .result-wrap { flex-direction:column; align-items:center; }
  .link-side { width:100%; }
  .action-bar { gap:10px; }
  .btn { flex:1; text-align:center; padding:10px 12px; }
}