:root{--bg:#f3f5f7;--card:#fff;--text:#1e293b;--muted:#64748b;--line:#e2e8f0;--brand:#0f766e;--brand-soft:#ccfbf1;--inc:#059669;--exp:#dc2626;--warn:#b45309;--r:14px;--nav-h:64px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
button,input,select{font:inherit;color:inherit}
h1{font-size:22px;margin:0}h2{font-size:17px;margin:18px 0 8px}h3{font-size:13px;margin:0 0 6px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.02em}
.inc{color:var(--inc)}.exp{color:var(--exp)}.muted{color:var(--muted)}.good{color:var(--inc)}.bad{color:var(--exp)}.center{text-align:center}
.shell{min-height:100vh}
.main{max-width:760px;margin:0 auto;padding:12px 14px calc(var(--nav-h) + 24px + env(safe-area-inset-bottom))}
.page-head{padding:6px 2px 10px}.page-head p{margin:2px 0 0;color:var(--muted)}

/* nav: dưới đáy trên điện thoại, cột trái trên máy tính */
.nav{position:fixed;z-index:10;left:0;right:0;bottom:0;display:flex;background:#fff;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
.nav .brand{display:none}
.nav button{flex:1;border:0;background:none;padding:8px 2px;display:flex;flex-direction:column;align-items:center;gap:1px;color:var(--muted);cursor:pointer;height:var(--nav-h)}
.nav button span{font-size:20px;line-height:1.2}.nav button b{font-size:11px;font-weight:600}
.nav button.active{color:var(--brand)}.nav button.active b{font-weight:800}
.nav .nav-add span{background:var(--brand);color:#fff;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;font-size:26px;margin-top:-18px;box-shadow:0 4px 12px #0f766e55}
@media (min-width:900px){
  .nav{top:0;right:auto;width:210px;flex-direction:column;border-top:0;border-right:1px solid var(--line);padding:16px 10px;gap:4px}
  .nav .brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;color:var(--brand);padding:4px 10px 14px}.nav .brand img{width:32px;height:32px;border-radius:8px}
  .nav button{flex:none;flex-direction:row;height:auto;gap:10px;padding:10px 12px;border-radius:10px}
  .nav button b{font-size:15px}.nav button.active{background:var(--brand-soft)}
  .nav .nav-add span{margin:0;width:28px;height:28px;font-size:18px;box-shadow:none}
  .main{margin-left:210px;max-width:900px;padding:24px 32px 40px}
  .main{margin-right:auto}
}

.cards{display:grid;gap:10px;grid-template-columns:1fr}
@media (min-width:600px){.cards{grid-template-columns:1fr 1fr}.cards.three{grid-template-columns:repeat(3,1fr)}}
.card,.panel{background:var(--card);border-radius:var(--r);padding:14px;box-shadow:0 1px 2px #0000000d}
.panel{margin:12px 0}.panel h2{margin-top:0}.panel p{margin:6px 0}
.card b{display:block;font-size:18px}.card b.big{font-size:21px}.card small{display:block;margin-top:2px}
.pair{display:flex;gap:12px}.pair>div{flex:1}.balance{border-top:1px dashed var(--line);margin-top:8px;padding-top:8px}
.quick{display:flex;gap:10px;margin:12px 0}.quick .btn{flex:1}
.sec-head{display:flex;justify-content:space-between;align-items:center;gap:8px}.sec-head h2{margin:18px 0 8px}

.btn{border:1px solid var(--line);background:#fff;border-radius:12px;padding:11px 16px;font-weight:600;cursor:pointer;min-height:44px}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.ghost{background:transparent;border-color:transparent;color:var(--muted)}
.btn.danger{color:var(--exp);border-color:#fecaca;background:#fff5f5}
.btn.small{padding:6px 10px;min-height:34px;font-size:13px}.btn.wide{width:100%;margin-top:10px}
.exp-btn{background:#fef2f2;border-color:#fecaca;color:var(--exp)}.inc-btn{background:#ecfdf5;border-color:#a7f3d0;color:var(--inc)}
.link{border:0;background:none;color:var(--brand);font-weight:600;cursor:pointer;padding:6px}
.icon-btn{border:1px solid var(--line);background:#fff;border-radius:10px;width:44px;height:44px;cursor:pointer}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 12px;cursor:pointer;white-space:nowrap;font-size:14px}
.chip.on{background:var(--brand-soft);border-color:var(--brand);color:var(--brand);font-weight:700}
.chips{display:flex;gap:6px;overflow-x:auto;padding:4px 0 8px}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}

.banner{display:flex;align-items:center;justify-content:space-between;gap:10px;background:#fffbeb;border:1px solid #fde68a;color:var(--warn);border-radius:12px;padding:10px 12px;margin-bottom:12px;font-size:14px}

.tx-list{background:var(--card);border-radius:var(--r);overflow:hidden}
.tx{display:flex;align-items:center;gap:10px;width:100%;border:0;border-bottom:1px solid var(--line);background:none;padding:10px 12px;text-align:left;cursor:pointer}
.tx:last-child{border-bottom:0}.tx:active{background:#f8fafc}
.ico{flex:none;width:36px;height:36px;border-radius:10px;display:grid;place-items:center;font-style:normal;font-size:19px;background:color-mix(in srgb,var(--c) 16%,#fff)}
.tx-main{flex:1;min-width:0;display:flex;flex-direction:column}.tx-main small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted)}
.amt{font-weight:700;white-space:nowrap}
.empty{text-align:center;color:var(--muted);padding:24px 8px}
.empty.err{color:var(--exp)}

.form .field{display:block;margin:14px 0}.form .field>span{display:block;font-weight:600;margin-bottom:6px}
.row{display:flex;gap:6px;align-items:center}
input:not([type=checkbox]),select{border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:#fff;min-height:44px;width:100%}
.row input{flex:1;min-width:0}
input.amount{font-size:28px;font-weight:800;padding:8px 12px}input.amount.expense{color:var(--exp)}input.amount.income{color:var(--inc)}
.seg{display:flex;background:#e2e8f0;border-radius:12px;padding:3px;gap:3px}
.seg button{flex:1;border:0;background:none;border-radius:10px;padding:9px 4px;font-weight:600;cursor:pointer;color:var(--muted)}
.seg button.on{background:#fff;color:var(--text);box-shadow:0 1px 3px #0000001a}
.seg button.on.exp{color:var(--exp)}.seg button.on.inc{color:var(--inc)}
.seg.mini button{padding:5px 14px}.modes{margin-bottom:10px}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:8px}
.cat{border:2px solid transparent;background:#fff;border-radius:12px;padding:8px 4px;display:flex;flex-direction:column;align-items:center;gap:3px;cursor:pointer;box-shadow:0 1px 2px #0000000f}
.cat i{font-style:normal;font-size:24px}.cat b{font-size:12px;font-weight:600;text-align:center;line-height:1.2}
.cat.on{border-color:var(--c);background:color-mix(in srgb,var(--c) 12%,#fff)}

.period-nav{display:flex;align-items:center;gap:8px;margin:8px 0}.period-nav input,.period-nav .period-label{flex:1;text-align:center}
.filters{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:8px}.filters input{grid-column:1/-1}
.totals{display:flex;flex-wrap:wrap;gap:6px 14px;padding:8px 2px;color:var(--muted);font-size:14px}
.day{margin-bottom:12px}.day-head{display:flex;justify-content:space-between;padding:4px 4px 6px;font-size:14px}.day-head b{color:var(--muted)}
.custom-range{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:8px 0}.custom-range label{font-size:13px;color:var(--muted)}

.chart{background:var(--card);border-radius:var(--r);padding:12px;margin-top:12px}
.chart svg{width:100%;height:auto;max-height:320px;display:block}
.chart text{font-size:10px;fill:var(--muted)}.chart .grid{stroke:#eef2f6}.chart .axis{stroke:#cbd5e1}
.b-inc{fill:var(--inc);background:var(--inc)}.b-exp{fill:var(--exp);background:var(--exp)}
.legend{display:flex;gap:14px;font-size:13px;margin-bottom:6px}.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:4px}
.catbar-wrap{margin-bottom:8px}
.catbar{display:block;width:100%;border:0;background:var(--card);border-radius:12px;padding:10px 12px;text-align:left;cursor:pointer}
.catbar-top{display:flex;justify-content:space-between;gap:8px}
.bar{display:block;height:8px;background:#eef2f6;border-radius:99px;margin:6px 0 4px;overflow:hidden}.bar i{display:block;height:100%;border-radius:99px}
.catbar-wrap .tx-list{margin-top:4px}

.status{border-radius:10px;padding:10px 12px;margin:10px 0;font-size:14px}.status.ok{background:#ecfdf5;color:#065f46}.status.warn{background:#fffbeb;color:var(--warn)}
.hint{font-size:13px;color:var(--muted)}
.preview{border:1px solid var(--line);border-radius:12px;padding:12px;margin-top:12px;background:#f8fafc}
.preview dl{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin:8px 0;font-size:14px}.preview dt{color:var(--muted)}.preview dd{margin:0;font-weight:600}
.check{display:flex;gap:8px;align-items:flex-start;font-size:14px;margin-top:8px}
.cat-admin{background:#f8fafc;border-radius:12px;margin-bottom:10px}
.cat-row{display:flex;align-items:center;gap:8px;padding:6px 8px;border-bottom:1px solid var(--line)}.cat-row:last-child{border-bottom:0}.cat-row span{flex:1}.cat-row.off{opacity:.55}
.add-cat{display:grid;grid-template-columns:56px 1fr 80px auto;gap:6px;margin-top:8px}
.danger-zone{border:1px solid #fecaca}
.foot{text-align:center;font-size:12px;color:var(--muted);margin:20px 0}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(var(--nav-h) + 16px + env(safe-area-inset-bottom));background:#1e293b;color:#fff;padding:10px 16px;border-radius:12px;z-index:20;max-width:90vw;font-size:14px;box-shadow:0 6px 20px #0003}
.toast.err{background:#b91c1c}
@media (min-width:900px){.toast{bottom:24px}}