:root{--bg:#ffffff;--bg2:#f7f7f5;--card:#ffffff;--border:#e6e6e3;--text:#1f1f1f;--muted:#6b6b68;--blue:#2783DE;--blue-bg:#eaf3fc;--green:#46A171;--green-bg:#e9f5ee;--orange:#D5803B;--orange-bg:#fbf0e6;--red:#E56458;--radius:10px;--shadow:0 1px 2px rgba(0,0,0,.04)}
@media (prefers-color-scheme: dark){:root{--bg:#191919;--bg2:#202020;--card:#232323;--border:#333331;--text:#e8e8e6;--muted:#9b9b98;--blue-bg:#1b2b3d;--green-bg:#1c2f25;--orange-bg:#3a2a1c;--shadow:none}}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
.app{max-width:1120px;margin:0 auto;padding:16px 24px 40px}
.title{font-size:24px;font-weight:700;margin:0 0 4px;letter-spacing:-.01em}
.sub{color:var(--muted);margin:0;font-size:14px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin:18px 0 20px;overflow-x:auto}
.tab{appearance:none;background:none;border:0;border-bottom:2px solid transparent;padding:10px 14px;font:inherit;font-weight:500;color:var(--muted);cursor:pointer;white-space:nowrap;margin-bottom:-1px}
.tab:hover{color:var(--text)}
.tab.active{color:var(--text);border-bottom-color:var(--text);font-weight:600}
.panel{display:none}.panel.active{display:block}
.grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:24px;align-items:start}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:16px;box-shadow:var(--shadow)}
.card h2{font-size:16px;margin:0 0 14px;display:flex;align-items:center;gap:8px}
details.card{padding:0}
details.card>summary{list-style:none;cursor:pointer;padding:14px 18px;font-size:16px;font-weight:600;display:flex;align-items:center;gap:8px}
details.card>summary::-webkit-details-marker{display:none}
details.card>summary .chev{margin-left:auto;color:var(--muted);font-size:20px;line-height:1;transition:transform .15s;transform:rotate(90deg)}
details.card[open]>summary .chev{transform:rotate(-90deg)}
details.card>.body{padding:0 18px 18px}
.num-badge{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:6px;background:var(--blue-bg);color:var(--blue);font-size:13px;font-weight:700;flex:none}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.field{margin-bottom:12px;min-width:0}
.label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.input{width:100%;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:9px 10px;min-height:40px;outline:none}
.input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(39,131,222,.15)}
.input.sm{padding:6px 8px;min-height:34px;font-size:14px}
.input:disabled{color:var(--muted);background:var(--bg2)}
.money{position:relative;display:block;min-width:0}
.money .input{text-align:right;padding-right:28px;font-variant-numeric:tabular-nums}
.money::after{content:'đ';position:absolute;right:10px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:14px;pointer-events:none}
.hint{font-size:13px;color:var(--muted);margin:6px 0 10px}
.muted{color:var(--muted)}
.small{font-size:13px}
details.inner{border:1px solid var(--border);border-radius:8px;margin:8px 0}
details.inner>summary{cursor:pointer;padding:9px 12px;font-weight:600;font-size:14px;list-style:none}
details.inner>summary::-webkit-details-marker{display:none}
details.inner>summary::before{content:'›';font-size:17px;line-height:1;display:inline-block;margin-right:6px;color:var(--muted);transition:transform .15s}
details.inner[open]>summary::before{transform:rotate(90deg)}
details.inner>.body{padding:4px 12px 12px}
.tbl-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th,.tbl td{padding:7px 8px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
.tbl th{font-weight:600;color:var(--muted);font-size:13px;white-space:nowrap}
.tbl .n{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.tbl tr.total td{font-weight:700;border-bottom:0}
.tbl tr.hl td{background:var(--orange-bg)}
.tbl tr.muted td{color:var(--muted)}
.btn{font:inherit;font-size:14px;padding:7px 12px;border-radius:8px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer}
.btn:hover{background:var(--bg2)}
.btn.icon{width:38px;padding:0;height:34px;font-size:18px;line-height:1;color:var(--muted)}
.check{display:flex;gap:8px;align-items:flex-start;font-size:14px;margin:8px 0;cursor:pointer}
.check input{margin:4px 0 0;flex:none}
.dyn{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) 92px 38px;gap:8px;margin-bottom:8px;align-items:center}
.dyn-dep{display:grid;grid-template-columns:minmax(0,1fr) 90px 90px;gap:8px;align-items:center;margin-bottom:8px;font-size:14px}
.dyn-dep .who{color:var(--muted);font-size:13px}
.hero{border-radius:var(--radius);padding:18px 20px;margin-bottom:16px;border:1px solid transparent}
.hero .kicker{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.85}
.hero .amount{font-size:34px;font-weight:800;letter-spacing:-.02em;margin:4px 0 2px;font-variant-numeric:tabular-nums}
.hero .meta{font-size:13px;opacity:.85}
.hero.refund{background:var(--green-bg);color:var(--green);border-color:rgba(70,161,113,.25)}
.hero.pay{background:var(--orange-bg);color:var(--orange);border-color:rgba(213,128,59,.3)}
.hero.zero{background:var(--bg2);color:var(--text);border-color:var(--border)}
.hero.zero .kicker,.hero.zero .meta{color:var(--muted)}
.status h3{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin:14px 0 6px}
.status ul{margin:0;padding-left:18px;font-size:14px}
.status li{margin:3px 0}
.note{background:var(--orange-bg);border-left:3px solid var(--orange);padding:8px 12px;border-radius:6px;font-size:14px;margin-top:12px}
.note.info{background:var(--blue-bg);border-left-color:var(--blue)}
.kv{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--border);font-size:14px}
.kv:last-child{border-bottom:0}
.kv .k small{display:block;color:var(--muted);font-size:12px}
.kv b{white-space:nowrap;font-variant-numeric:tabular-nums}
.kv.total .k{font-weight:700}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600;line-height:1.4}
.pill.gray{background:var(--bg2);color:var(--muted);border:1px solid var(--border)}
.pill.green{background:var(--green-bg);color:var(--green)}
.pill.orange{background:var(--orange-bg);color:var(--orange)}
.pill.blue{background:var(--blue-bg);color:var(--blue)}
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:6px}
.opt{border:1px solid var(--border);border-radius:8px;padding:10px 12px}
.opt.best{border-color:var(--green);box-shadow:inset 0 0 0 1px var(--green)}
.opt .t{font-size:13px;color:var(--muted)}
.opt .v{font-size:15px;font-weight:600;margin:4px 0}
.formula{background:var(--bg2);border:1px solid var(--border);border-radius:8px;padding:12px 14px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;white-space:pre-wrap;line-height:1.55;overflow-x:auto}
.src{font-size:13px;color:var(--muted);border-top:1px solid var(--border);padding-top:12px;margin-top:20px}
.prose{max-width:860px}
.prose h2{font-size:18px;margin:24px 0 10px}
.prose h2:first-child{margin-top:4px}
.prose h3{font-size:15px;margin:16px 0 6px}
.prose p{margin:8px 0}
.prose ul,.prose ol{padding-left:22px;margin:8px 0}
.prose li{margin:4px 0}
.prose .tbl-wrap{margin:8px 0 12px}
.faq details{border:1px solid var(--border);border-radius:8px;margin-bottom:8px}
.faq summary{cursor:pointer;padding:12px 14px;font-weight:600;list-style:none;font-size:15px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:'+';display:inline-block;width:18px;color:var(--blue);font-weight:700}
.faq details[open] summary::before{content:'−'}
.faq .a{padding:0 14px 12px 32px;font-size:14px}
.faq .a p{margin:0}
.good{color:var(--green);font-weight:600}
.bad{color:var(--orange);font-weight:600}
@media (max-width:900px){.grid{grid-template-columns:1fr}.app{padding:12px 16px 32px}}
@media (max-width:560px){.row,.row3{grid-template-columns:1fr}.dyn{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 38px}.dyn .b-name{grid-column:1 / 3}.dyn .b-del{grid-column:3;grid-row:1}.dyn-dep{grid-template-columns:1fr 1fr}.dyn-dep .who{grid-column:1 / -1}.cmp{grid-template-columns:1fr}.title{font-size:19px}.hero .amount{font-size:28px}.tab{padding:10px 10px;font-size:14px}}
@media (prefers-reduced-motion: reduce){*{transition:none !important}}