:root{
  --bg:#EEF3F6; --card:#FFFFFF; --ink:#132A45; --muted:#62748A; --line:#D8E1E8;
  --teal:#0C8577; --teal-soft:#D5EEEA; --sun:#F2B705; --danger:#C2412D;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0F1B2A; --card:#172638; --ink:#E7EEF5; --muted:#93A4B8; --line:#26384D;
    --teal:#2BB5A4; --teal-soft:#173F3D; --sun:#F2C230; --danger:#F07A64;
  }
}
:root[data-theme="dark"]{
  --bg:#0F1B2A; --card:#172638; --ink:#E7EEF5; --muted:#93A4B8; --line:#26384D;
  --teal:#2BB5A4; --teal-soft:#173F3D; --sun:#F2C230; --danger:#F07A64;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  font-size:16px;line-height:1.5;-webkit-tap-highlight-color:transparent}
.wrap{max-width:560px;margin:0 auto;padding:20px 16px 48px}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}

/* Hero: luggage tag */
.tag{position:relative;background:var(--ink);color:var(--bg);border-radius:22px 22px 22px 22px;
  padding:22px 20px 20px;overflow:hidden}
.tag::before{content:"";position:absolute;top:18px;right:18px;width:18px;height:18px;border-radius:50%;
  background:var(--bg);box-shadow:0 0 0 4px color-mix(in srgb,var(--bg) 30%,transparent)}
.trip-name{display:block;width:calc(100% - 40px);background:none;border:0;padding:0;
  font-size:30px;font-weight:800;letter-spacing:-.02em;line-height:1.15;color:inherit}
.trip-name::placeholder{color:color-mix(in srgb,var(--bg) 55%,transparent)}
.meta{display:flex;align-items:center;gap:10px;margin-top:10px;flex-wrap:wrap;
  color:color-mix(in srgb,var(--bg) 75%,transparent);font-size:15px}
.meta input[type=date]{background:color-mix(in srgb,var(--bg) 14%,transparent);border:0;border-radius:10px;
  padding:6px 10px;color:var(--bg);min-height:36px;color-scheme:dark}
.count{font-weight:600;color:var(--sun)}
.bignum{display:flex;align-items:baseline;gap:8px;margin-top:22px}
.bignum b{font-size:56px;font-weight:800;letter-spacing:-.04em;line-height:1}
.bignum span{font-size:15px;color:color-mix(in srgb,var(--bg) 75%,transparent)}
.strap{margin-top:12px;height:12px;border-radius:6px;background:color-mix(in srgb,var(--bg) 16%,transparent);overflow:hidden}
.strap i{display:block;height:100%;width:0;background:var(--sun);border-radius:6px;transition:width .35s ease}

/* toolbar */
.bar{display:flex;gap:8px;margin:16px 0 8px;flex-wrap:wrap}
.chip{border:1.5px solid var(--line);background:var(--card);border-radius:999px;padding:8px 14px;
  font-size:14px;font-weight:500;min-height:40px}
.chip[aria-pressed="true"]{background:var(--teal);border-color:var(--teal);color:#fff}

/* sections */
.sec{background:var(--card);border-radius:18px;margin-top:12px;border:1px solid var(--line)}
.sec-head{display:flex;align-items:center;gap:12px;width:100%;background:none;border:0;padding:16px;text-align:left}
.emo{font-size:24px;width:32px;text-align:center;flex:none}
.sec-title{flex:1;min-width:0}
.sec-title strong{display:block;font-size:17px;font-weight:600}
.sec-title small{color:var(--muted);font-size:13px}
.mini{width:44px;height:6px;border-radius:3px;background:var(--line);overflow:hidden;flex:none}
.mini i{display:block;height:100%;background:var(--teal)}
.sec.done .mini i{background:var(--sun)}
.chev{transition:transform .2s;color:var(--muted);flex:none}
.sec.open .chev{transform:rotate(90deg)}
.list{list-style:none;margin:0;padding:0 8px 8px;display:none}
.sec.open .list{display:block}
.item{display:flex;align-items:center;gap:4px;border-top:1px solid var(--line)}
.item label{flex:1;display:flex;align-items:center;gap:12px;padding:12px 8px;min-height:50px;cursor:pointer}
.item input{position:absolute;opacity:0;pointer-events:none}
.box{flex:none;width:26px;height:26px;border-radius:8px;border:2px solid var(--muted);display:grid;place-items:center;
  transition:background .15s,border-color .15s}
.box svg{width:16px;height:16px;opacity:0;transform:scale(.5);transition:.15s}
.item input:checked + .box{background:var(--teal);border-color:var(--teal)}
.item input:checked + .box svg{opacity:1;transform:none}
.item input:focus-visible + .box{outline:3px solid var(--sun);outline-offset:2px}
.item input:checked ~ .txt{color:var(--muted);text-decoration:line-through;text-decoration-thickness:1.5px}
.del{display:none;border:0;background:none;color:var(--danger);width:44px;height:44px;border-radius:10px;font-size:22px}
body.editing .del{display:block}
.add{display:flex;gap:8px;padding:10px 8px 6px;border-top:1px solid var(--line)}
.add input{flex:1;min-width:0;border:1.5px solid var(--line);background:var(--bg);border-radius:12px;padding:10px 12px;font-size:16px}
.add button{border:0;background:var(--teal);color:#fff;border-radius:12px;padding:0 16px;font-weight:600;min-height:44px}
.sec-del{display:none;margin:4px 8px 10px;border:0;background:none;color:var(--danger);font-size:14px;padding:8px}
body.editing .sec-del{display:inline-block}
.empty{color:var(--muted);padding:12px 8px;font-size:14px}

.newsec{display:flex;gap:8px;margin-top:16px}
.newsec input{flex:1;min-width:0;border:1.5px dashed var(--line);background:transparent;border-radius:14px;padding:12px 14px;font-size:16px}
.newsec button{border:0;background:var(--ink);color:var(--bg);border-radius:14px;padding:0 16px;font-weight:600;min-height:48px}
.sec-row{display:flex;align-items:center}
.sec-row .sec-head{flex:1;min-width:0;padding-right:4px}
.grip{flex:none;width:48px;align-self:stretch;min-height:56px;display:grid;place-items:center;border:0;background:none;
  color:var(--muted);touch-action:none;cursor:grab;border-radius:0 18px 18px 0;-webkit-user-select:none;user-select:none}
.grip:active{cursor:grabbing}
.grip svg{width:20px;height:20px}
#sections.sorting .list{display:none!important}
#sections.sorting{-webkit-user-select:none;user-select:none}
.igrip{flex:none;width:40px;height:48px;display:grid;place-items:center;border:0;background:none;color:var(--muted);
  opacity:.55;touch-action:none;cursor:grab;border-radius:10px;-webkit-user-select:none;user-select:none}
.igrip svg{width:18px;height:18px}
.item.dragging{position:relative;z-index:5;background:var(--card);border-radius:12px;border-top-color:transparent;
  box-shadow:0 10px 24px -8px rgba(19,42,69,.45);outline:2px solid var(--teal);transition:none}
.item.settle{transition:transform .18s ease}
body.is-dragging{-webkit-user-select:none;user-select:none}
.sec.dragging{position:relative;z-index:5;box-shadow:0 14px 30px -10px rgba(19,42,69,.45);border-color:var(--teal);transition:none}
.sec.settle{transition:transform .18s ease}
.foot{margin-top:28px;color:var(--muted);font-size:13px;text-align:center}
.foot button{border:0;background:none;color:var(--danger);text-decoration:underline;font-size:13px;padding:8px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* ---- Tài khoản & đồng bộ ---- */
[hidden]{display:none!important}
.acct{display:flex;align-items:center;gap:8px;margin:0 2px 12px;font-size:13px;color:var(--muted)}
.acct #who{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.acct button{border:0;background:none;color:var(--muted);text-decoration:underline;padding:8px 4px;font-size:13px}
#sync{display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
#sync::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--teal)}
#sync[data-kind="busy"]::before{background:var(--sun)}
#sync[data-kind="off"]::before{background:var(--danger)}
.warn{background:var(--teal-soft);border-radius:14px;padding:12px 14px;font-size:14px;margin-bottom:12px}

.auth{min-height:100%;display:flex;flex-direction:column;justify-content:center;max-width:420px;margin:0 auto;padding:32px 20px}
.auth h1{font-size:40px;font-weight:800;letter-spacing:-.03em;line-height:1.05;margin:0 0 8px}
.auth h1 span{color:var(--teal)}
.auth p.lead{color:var(--muted);margin:0 0 28px}
.tabs{display:flex;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:4px;margin-bottom:16px}
.tabs button{flex:1;border:0;background:none;border-radius:10px;padding:10px;font-weight:600;color:var(--muted);min-height:44px}
.tabs button[aria-selected="true"]{background:var(--ink);color:var(--bg)}
.field{display:block;margin-bottom:12px}
.field span{display:block;font-size:14px;font-weight:500;margin-bottom:6px}
.field input{width:100%;border:1.5px solid var(--line);background:var(--card);border-radius:14px;padding:13px 14px;font-size:16px}
.field input:focus{border-color:var(--teal);outline:none}
#authSubmit{width:100%;border:0;background:var(--teal);color:#fff;border-radius:14px;padding:14px;font-weight:600;font-size:17px;min-height:52px;margin-top:4px}
#authSubmit:disabled{opacity:.6}
#authMsg{min-height:24px;margin-top:12px;font-size:14px;color:var(--muted)}
#authMsg[data-kind="err"]{color:var(--danger)}
#authMsg[data-kind="ok"]{color:var(--teal)}
html,body{height:100%}