:root{--bg: #f4f5f7;--surface: #ffffff;--surface-2: #f0f1f4;--border: #dcdfe5;--text: #1d2129;--muted: #6b7280;--accent: #2f6feb;--accent-soft: #e8f0fe;--danger: #d93a3a;--warn-bg: #fff6e5;--warn-border: #f0c169;--pos: #1a7f4b;--neg: #c23b3b;--radius: 10px;--shadow: 0 1px 2px rgba(16, 24, 40, .06)}@media(prefers-color-scheme:dark){:root{--bg: #14161a;--surface: #1c1f25;--surface-2: #23272f;--border: #333842;--text: #e7e9ee;--muted: #9aa1ae;--accent: #5b91ff;--accent-soft: #22314f;--danger: #ef6b6b;--warn-bg: #38300f;--warn-border: #7a6420;--pos: #4ec98a;--neg: #ef7d7d;--shadow: none}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans Thai,Sarabun,Roboto,sans-serif;font-size:15px;line-height:1.5;-webkit-text-size-adjust:100%}h1,h2,h3{margin:0;font-weight:650}input,select,button{font:inherit;color:inherit}input,select{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:7px 10px;min-width:0}input:focus,select:focus,button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.app-bar{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;padding:12px 18px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.app-bar h1{font-size:19px;letter-spacing:-.01em}.app-sub{color:var(--muted);font-size:12.5px}.app-main{max-width:1240px;margin:0 auto;padding:18px 18px 90px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}.panel-title{font-size:14px;text-transform:none}.count{color:var(--muted);font-weight:400;font-size:12.5px}.empty-hint{color:var(--muted);font-size:13.5px;margin:6px 0}.hint{color:var(--muted);font-size:12.5px;margin:6px 0 0}.btn{background:var(--surface-2);border:1px solid var(--border);border-radius:8px;padding:8px 14px;cursor:pointer}.btn:hover:not(:disabled){border-color:var(--accent)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}.btn-ghost{background:transparent;border-style:dashed;color:var(--muted);width:100%;margin-top:8px}.icon-btn{background:transparent;border:none;color:var(--muted);font-size:20px;line-height:1;padding:2px 7px;border-radius:6px;cursor:pointer}.icon-btn:hover{color:var(--danger);background:var(--surface-2)}.link-btn{background:none;border:none;color:var(--accent);padding:2px 4px;font-size:12.5px;cursor:pointer;border-radius:6px}.link-btn:hover{background:var(--accent-soft)}.tag-row{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:8px 0}.tag{--tag-color: var(--muted);display:inline-flex;align-items:center;gap:4px;background:color-mix(in srgb,var(--tag-color) 12%,var(--surface));border:1px solid color-mix(in srgb,var(--tag-color) 40%,var(--border));border-left:3px solid var(--tag-color);border-radius:20px;padding:2px 4px 2px 10px;font-size:13.5px;white-space:nowrap}.tag-name,.tag-remove{background:none;border:none;cursor:pointer;padding:2px 4px;border-radius:12px}.tag-remove{color:var(--muted);font-size:15px;line-height:1}.tag-remove:hover{color:var(--danger)}.tag-edit{border-radius:20px;width:130px}.tag-toggle{cursor:pointer;padding:3px 11px;background:var(--surface-2);border:1px solid var(--border);border-left:3px solid transparent;color:var(--muted)}.tag-toggle.on{background:color-mix(in srgb,var(--tag-color) 16%,var(--surface));border-color:color-mix(in srgb,var(--tag-color) 45%,var(--border));border-left-color:var(--tag-color);color:var(--text);font-weight:600}.tag-toggle small{font-weight:400;color:var(--muted);font-variant-numeric:tabular-nums}.add-member{display:flex;gap:8px}.add-member input{flex:1 1 200px;max-width:340px}.trip-list{display:grid;gap:12px}.new-trip{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}.new-trip input{flex:1 1 200px;max-width:380px}.new-trip select{max-width:260px}.trips{list-style:none;margin:0;padding:0;display:grid;gap:10px}.trip-card{display:flex;align-items:center;gap:10px;padding:10px 12px}.trip-open{flex:1;display:flex;flex-direction:column;align-items:flex-start;gap:2px;background:none;border:none;text-align:left;cursor:pointer;padding:2px;border-radius:8px}.trip-open:hover .trip-name{color:var(--accent)}.trip-name{font-weight:600}.trip-sub{color:var(--muted);font-size:12.5px}.trip-total{font-variant-numeric:tabular-nums;font-weight:600}.trip-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}.trip-title{flex:1 1 200px;font-size:17px;font-weight:650;border-color:transparent;background:transparent}.trip-title:hover{border-color:var(--border)}.trip-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:16px;align-items:start}.col-bills{display:grid;gap:12px;min-width:0}.col-summary{position:sticky;top:72px}.add-bill{justify-self:start}.bill-warn{border-color:var(--warn-border)}.bill-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}.bill-label{color:var(--muted);font-size:12.5px}.payer-tags{margin:6px 0 0}.bill-meta{display:flex;align-items:center;gap:4px}.bill-total{font-variant-numeric:tabular-nums;font-weight:650;font-size:16px}.bill-note{width:100%;margin:10px 0 4px;border-color:transparent;background:var(--surface-2)}.items{display:grid;gap:8px;margin-top:6px}.item{border:1px solid var(--border);border-radius:8px;padding:8px 9px;background:var(--surface)}.item-warn{background:var(--warn-bg);border-color:var(--warn-border)}.item-main{display:flex;gap:8px;align-items:center}.item-name{flex:1}.money-input{width:104px;text-align:right;font-variant-numeric:tabular-nums}.item-shares{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:8px}.shares-label{color:var(--muted);font-size:12.5px}.share-actions{display:flex;gap:2px;flex-wrap:wrap}.item-warn-text{color:var(--danger);font-size:12.5px;margin:6px 0 0}.summary{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;display:grid;gap:14px;max-height:calc(100vh - 100px);overflow-y:auto}.summary-head{display:flex;justify-content:space-between;align-items:baseline}.grand-total{font-size:18px;font-weight:700;font-variant-numeric:tabular-nums}.warnings{margin:0;padding:8px 10px 8px 26px;background:var(--warn-bg);border:1px solid var(--warn-border);border-radius:8px;font-size:12.5px;display:grid;gap:4px}.payer-block,.net-block{border-top:1px solid var(--border);padding-top:12px}.payer-title{font-size:14px;display:flex;align-items:center;gap:7px}.dot{width:9px;height:9px;border-radius:50%;display:inline-block;flex:none}.rows{list-style:none;margin:0;padding:0;display:grid;gap:3px}.rows li{display:flex;justify-content:space-between;gap:10px;padding:3px 0}.row-name{display:flex;align-items:center;gap:7px;min-width:0}.row-amount{font-variant-numeric:tabular-nums;font-weight:600;white-space:nowrap}.row-amount.pos{color:var(--pos)}.row-amount.neg{color:var(--neg)}.own-row .row-name,.own-row .row-amount{color:var(--muted)}.payer-collect{display:flex;justify-content:space-between;margin:8px 0 0;padding-top:7px;border-top:1px dashed var(--border);font-variant-numeric:tabular-nums}.payer-paid{display:flex;justify-content:space-between;margin:2px 0 0;color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums}.breakdown-toggle{cursor:pointer;list-style:none;display:flex;align-items:center;gap:6px;font-weight:650}.breakdown-toggle::-webkit-details-marker{display:none}.breakdown-toggle:before{content:"▾";color:var(--muted);font-size:11px;transition:transform .15s}.breakdown:not([open]) .breakdown-toggle:before{transform:rotate(-90deg)}.breakdown-bill+.breakdown-bill{margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}.breakdown-head{display:flex;justify-content:space-between;gap:8px;margin:10px 0 6px;font-size:13.5px;font-weight:650;font-variant-numeric:tabular-nums}.breakdown-head .row-name{overflow-wrap:anywhere}.breakdown-items{list-style:none;margin:0;padding:0;display:grid;gap:6px}.breakdown-items>li{padding-left:16px}.breakdown-item-line{display:flex;justify-content:space-between;gap:8px}.breakdown-item-name{min-width:0;overflow-wrap:anywhere}.breakdown-share{display:block;color:var(--muted);font-size:12px;line-height:1.45}.share-buttons{display:grid;grid-template-columns:1fr 1fr;gap:6px}.share-buttons>:first-child{grid-column:1 / -1}.mobile-tabs{display:none}@media(max-width:899px){.app-main{padding:14px 12px 84px}.trip-layout{grid-template-columns:minmax(0,1fr)}.col-summary{position:static}.summary{max-height:none}.mobile-hidden{display:none}.mobile-tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;position:fixed;inset:auto 0 0 0;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--border);z-index:30}.mobile-tabs button{background:var(--surface-2);border:1px solid var(--border);border-radius:8px;padding:11px;font-weight:600;cursor:pointer}.mobile-tabs button.on{background:var(--accent);border-color:var(--accent);color:#fff}.item-main{flex-wrap:wrap}.item-name{flex:1 1 100%}.money-input{flex:1;width:auto;font-size:16px}.item-name,.bill-note{font-size:16px}}.about{max-width:720px;margin:8px auto 0;padding:26px 18px 96px;border-top:1px solid var(--border);color:var(--muted);font-size:14px;line-height:1.7}.about h2{color:var(--text);font-size:17px;margin-bottom:10px}.about h3{color:var(--text);font-size:14.5px;margin:22px 0 8px}.about p{margin:0 0 12px}.about strong{color:var(--text);font-weight:600}.about ul{margin:0;padding-left:20px}.about li{margin-bottom:4px}.about dl{margin:0}.about dt{color:var(--text);font-weight:600;margin-top:14px}.about dd{margin:3px 0 0}.about-note{margin-top:22px;padding-top:14px;border-top:1px dashed var(--border);font-size:13px}