:root{
  --red:#c0392b; --red-d:#962d22; --bg:#f5f5f0; --card:#fff;
  --ink:#222; --mut:#888; --line:#e3e3dc;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;font-family:"宋体","SimSun",serif;
  background:var(--bg);color:var(--ink);font-size:16px}
.screen{display:none;min-height:100vh;padding:0 0 90px}
.screen.active{display:block}

/* 登入 */
#login{display:none;align-items:center;justify-content:center}
#login.active{display:flex}
.login-card{background:var(--card);width:86%;max-width:360px;border-radius:18px;
  padding:34px 26px;text-align:center;box-shadow:0 10px 40px rgba(0,0,0,.12)}
.logo{font-size:54px}
.login-card h1{margin:8px 0 2px;font-size:26px;letter-spacing:2px}
.login-card .sub{color:var(--mut);margin:0 0 22px;font-size:14px}
#pin{width:100%;padding:14px;border:1px solid var(--line);border-radius:12px;
  font-size:22px;text-align:center;letter-spacing:8px;font-family:inherit}
#btnLogin{width:100%;margin-top:16px;padding:14px;border:0;border-radius:12px;
  background:var(--red);color:#fff;font-size:18px;font-family:inherit}
.hint{color:var(--mut);font-size:12px;margin-top:14px}

/* 頂欄 */
.topbar{background:var(--red);color:#fff;padding:14px 18px;display:flex;
  justify-content:space-between;font-size:15px;position:sticky;top:0;z-index:5;align-items:center}
.settings-btn{background:none;border:none;color:#fff;font-size:22px;cursor:pointer;
  padding:2px 6px;border-radius:8px;line-height:1;min-width:36px;transition:transform .4s ease}
.settings-btn:active{background:rgba(255,255,255,.2)}
.stat-row{display:flex;gap:10px;padding:16px}
.stat{flex:1;background:var(--card);border-radius:14px;text-align:center;
  padding:14px 6px;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.stat b{display:block;font-size:24px;color:var(--red)}
.stat span{font-size:12px;color:var(--mut)}

.big-btn{display:block;width:90%;margin:8px auto;padding:16px;border:0;border-radius:14px;
  background:var(--red);color:#fff;font-size:18px;font-family:inherit;box-shadow:0 4px 14px rgba(192,57,43,.3)}
.ghost{background:#fff;color:var(--red);border:1px solid var(--red)}

h3{margin:18px 18px 8px;font-size:16px}
.receipt-list{list-style:none;margin:0;padding:0 14px}
.receipt-list li{background:var(--card);border-radius:12px;padding:12px 14px;margin-bottom:10px;
  display:flex;align-items:center;gap:12px;box-shadow:0 1px 6px rgba(0,0,0,.05)}
.receipt-list .thumb{width:46px;height:46px;border-radius:8px;object-fit:cover;background:#eee}
.receipt-list .info{flex:1}
.receipt-list .info .s{font-size:16px}
.receipt-list .info .m{font-size:13px;color:var(--mut)}
.tag{font-size:12px;padding:3px 9px;border-radius:20px}
.tag.paid{background:#e6f4ea;color:#1e7d3a}
.tag.unpaid{background:#fdecea;color:#c0392b}
.receipt-list li{cursor:pointer}
.li-edit{flex:none;width:38px;height:38px;border-radius:50%;border:1px solid var(--red);
  background:#fff;color:var(--red);font-size:17px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.li-edit:active{background:#fbe9e7}
.li-del{flex:none;width:38px;height:38px;border-radius:50%;border:1px solid var(--red);
  background:#fff;color:var(--red);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;margin-right:8px}
.li-del:active{background:#fbe9e7}
.del-btn{width:100%;margin-top:8px;color:var(--red);border-color:var(--red)}
.del-btn:active{background:#fbe9e7}
.empty{text-align:center;color:var(--mut);font-size:14px;margin-top:24px}
.actions{display:flex;gap:10px;padding:14px}
.actions .ghost{flex:1;margin:0;padding:13px}

/* modal */
.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);
  align-items:center;justify-content:center;z-index:20;padding:16px}
.modal.active{display:flex}
.modal-card{background:var(--card);width:100%;max-width:420px;border-radius:18px;
  padding:18px;max-height:92vh;overflow:auto}
.rv-img{width:100%;border-radius:12px;margin-bottom:12px;background:#eee;max-height:200px;object-fit:contain}
.retake-btn{display:block;width:90%;margin:0 auto 14px;padding:13px;border-radius:12px;font-size:16px;font-family:inherit;text-align:center}
.retake-btn:active{background:#fbe9e7}
.share-btn{border:2px solid #1e7d3a;color:#1e7d3a;font-weight:600}
.share-btn:active{background:#e8f5ec}
.up-btn{display:block;width:90%;margin:0 auto 12px;padding:13px;border-radius:12px;font-size:15px;font-family:inherit;text-align:center;background:#fff;color:var(--red);border:1px solid var(--red);cursor:pointer}
.up-btn:active{background:#fbe9e7}
.rv-block{margin-bottom:14px}
.rv-block label{font-size:13px;color:var(--mut);display:block;margin-bottom:6px}
.rv-amount{font-size:30px;color:var(--red);font-weight:bold}
.rv-sup{font-size:20px}
.rv-btns{display:flex;gap:10px;margin-top:8px}
.ok,.fix{flex:1;padding:11px;border-radius:10px;font-family:inherit;font-size:15px;border:0}
.ok{background:var(--red);color:#fff}
.fix{background:#eee;color:var(--ink)}
.amt-input,.sup-select{width:100%;padding:12px;border:1px solid var(--line);border-radius:10px;
  font-family:inherit;font-size:18px;margin-top:8px}
.seg{display:flex;gap:10px}
.seg-btn{flex:1;padding:13px;border:1px solid var(--line);border-radius:10px;background:#fff;font-family:inherit;font-size:16px}
.seg-btn.on{background:var(--red);color:#fff;border-color:var(--red)}

.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);
  background:#333;color:#fff;padding:11px 20px;border-radius:24px;font-size:14px;
  opacity:0;transition:.25s;z-index:50;pointer-events:none}
.toast.show{opacity:1}
canvas{max-width:100%;border-radius:10px;background:#fff}
/* 供應商管理 */
.sup-list{list-style:none;padding:0;margin:8px 0;max-height:46vh;overflow:auto}
.sup-list li{display:flex;align-items:center;justify-content:space-between;
  padding:11px 14px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;font-size:16px}
.sup-del{border:0;background:#fbe9e7;color:var(--red);border-radius:8px;
  width:32px;height:32px;font-size:15px;flex:none}
.sup-add{display:flex;gap:8px;margin-top:6px}
.sup-add input{flex:1;padding:11px;border:1px solid var(--line);border-radius:10px;font-family:inherit;font-size:16px}
.sup-add .ok{flex:none;padding:11px 16px}
/* 貨單列表操作人 */
.op{font-size:12px;color:var(--mut);margin-top:2px}
/* 多用户登入 */
.user-pick{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:6px 0 14px}
.upick{padding:10px 18px;border:1.5px solid #e0c9c5;border-radius:10px;background:#fff;font-size:15px;font-family:inherit;cursor:pointer}
.upick.on{background:var(--red);color:#fff;border-color:var(--red)}
.reg-box{display:flex;flex-direction:column;gap:8px;margin:10px 0}
.reg-box input{padding:12px;border:1.5px solid #e0c9c5;border-radius:10px;font-size:15px;font-family:inherit;text-align:center}
.link{background:none;border:none;color:var(--red);font-size:13px;margin-top:6px;cursor:pointer;text-decoration:underline}

/* 編輯工具列（旋轉 / 裁剪 / 原圖） */
.edit-bar{display:flex;gap:8px;margin:0 0 12px}
.ebtn{flex:1;padding:11px 4px;border:1px solid var(--red);border-radius:10px;background:#fff;color:var(--red);font-family:inherit;font-size:15px}
.ebtn:active{background:#fbe9e7}
/* 裁剪 */
.crop-card{overflow:visible}
.crop-wrap{position:relative;display:inline-block;max-width:100%;touch-action:none;user-select:none;margin:0 auto}
.crop-img{display:block;max-width:100%;height:auto}
.crop-sel{position:absolute;border:2px solid #fff;box-shadow:0 0 0 9999px rgba(0,0,0,.5);cursor:move}
.crop-sel .h{position:absolute;width:20px;height:20px;background:#fff;border:2px solid var(--red);border-radius:50%}
.crop-sel .h.tl{left:-11px;top:-11px;cursor:nwse-resize}
.crop-sel .h.tr{right:-11px;top:-11px;cursor:nesw-resize}
.crop-sel .h.bl{left:-11px;bottom:-11px;cursor:nesw-resize}
.crop-sel .h.br{right:-11px;bottom:-11px;cursor:nwse-resize}

/* 長按圖片彈出選單（似外賣車手 / 微信） */
.img-menu{align-items:flex-end;padding:0}
.img-menu .modal-card{position:static;max-width:none;width:100%;border-radius:18px 18px 0 0;padding:0}
.img-menu-title{text-align:center;color:var(--mut);font-size:13px;padding:14px 0 10px}
.img-menu-item{display:block;width:100%;padding:17px;border:0;background:#fff;color:var(--ink);
  font-size:17px;font-family:inherit;border-bottom:1px solid var(--line);text-align:center}
.img-menu-item:active{background:#fbe9e7}
.img-menu-item.cancel{color:var(--red);font-weight:600;border-bottom:none;border-radius:0 0 16px 16px;margin-top:6px}
.img-menu-item.del{color:var(--red);font-weight:600}
/* 阻止 iOS 長按彈出系統選單，改為我哋自己嘅選單 */
.receipt-list .thumb, #rvImg{-webkit-touch-callout:none;user-select:none}

/* 修改記錄（邊個改咗乜） */
.history{margin:6px 2px 2px;font-size:12px;color:var(--mut);border-top:1px dashed var(--line);padding-top:8px}
.hist-title{color:var(--red);font-weight:600;margin-bottom:4px}
.hist-line{line-height:1.5;color:#444}
.hist-line b{color:var(--ink)}
.hist-time{color:#aaa;font-size:10px;margin-left:6px}

/* 單據模式：自動辨識 / 手寫單手填 */
[hidden]{display:none !important}
.mode-seg{display:flex;gap:8px;margin:4px 0 10px}
.mode-btn{flex:1;padding:12px 4px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);font-family:inherit;font-size:15px;cursor:pointer}
.mode-btn.on{background:var(--red);color:#fff;border-color:var(--red)}
.mode-btn:active{filter:brightness(.94)}