:root{--primary: #2563eb;--primary-dark: #1d4ed8;--bg: #f1f5f9;--card: #ffffff;--text: #0f172a;--text-sub: #64748b;--border: #e2e8f0;--danger: #dc2626;--plus: #059669;--minus: #dc2626}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Noto Sans JP,Yu Gothic UI,sans-serif;font-size:16px;line-height:1.5}.page{max-width:480px;margin:0 auto;padding:16px;min-height:100vh}.page.has-tabbar{padding-bottom:84px}.app-header{text-align:center;padding:16px 0 8px}.app-header h1{margin:0;font-size:1.6rem}.app-header .sub{margin:4px 0 0;color:var(--text-sub);font-size:.9rem}.group-header{display:flex;align-items:center;gap:10px;padding:4px 0 12px}.group-header h1{margin:0;font-size:1.2rem;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.back-link{font-size:1.6rem;text-decoration:none;color:var(--text-sub);padding:0 8px;line-height:1}.me-badge{background:var(--primary);color:#fff;border-radius:999px;padding:2px 12px;font-size:.8rem;white-space:nowrap}.section{margin-bottom:20px}.section h2{font-size:1rem;margin:0 0 8px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px}.card-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.btn{border:none;border-radius:10px;padding:12px 18px;font-size:1rem;cursor:pointer;font-family:inherit}.btn.primary{background:var(--primary);color:#fff}.btn.primary:active{background:var(--primary-dark)}.btn.primary:disabled{opacity:.5}.btn.secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn.wide,.btn-text.wide{display:block;width:100%;text-align:center}.btn-text{background:none;border:none;color:var(--primary);font-size:.9rem;cursor:pointer;padding:8px;font-family:inherit}.btn-text.danger{color:var(--danger)}.fab{position:fixed;right:16px;bottom:76px;background:var(--primary);color:#fff;border:none;border-radius:999px;padding:14px 20px;font-size:1rem;font-weight:700;box-shadow:0 4px 12px #2563eb66;cursor:pointer;font-family:inherit}.form{display:flex;flex-direction:column;gap:12px}.form h2{margin:0}.form label{display:flex;flex-direction:column;gap:4px;font-size:.85rem;color:var(--text-sub)}.form input,.form select{border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:1rem;color:var(--text);background:#fff;font-family:inherit;width:100%}.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}.form-actions{display:grid;grid-template-columns:1fr 2fr;gap:10px}.participants{border:1px solid var(--border);border-radius:8px;padding:10px 12px;display:flex;flex-wrap:wrap;gap:6px 14px}.participants legend{font-size:.85rem;color:var(--text-sub);padding:0 4px}.checkbox{flex-direction:row!important;align-items:center;gap:6px!important;font-size:1rem!important;color:var(--text)!important}.checkbox input{width:20px!important;height:20px}.group-card{display:flex;align-items:center;gap:8px}.group-link{flex:1;text-decoration:none;color:var(--text);display:flex;flex-direction:column}.group-name{font-weight:700}.group-date{font-size:.8rem;color:var(--text-sub)}.member-grid{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.member-chip{border:1px solid var(--border);background:var(--card);border-radius:999px;padding:10px 18px;font-size:1rem;cursor:pointer;font-family:inherit}.member-chip.selected{background:var(--primary);color:#fff;border-color:var(--primary)}.expense-card{cursor:pointer}.expense-row{display:flex;justify-content:space-between;gap:10px}.expense-main{display:flex;flex-direction:column;min-width:0}.expense-title{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.expense-meta{font-size:.8rem;color:var(--text-sub)}.expense-amounts{display:flex;flex-direction:column;align-items:flex-end;white-space:nowrap}.expense-amount{font-weight:700}.expense-share{font-size:.8rem;color:var(--text-sub)}.balance-card,.pair-card,.member-row{display:flex;justify-content:space-between;align-items:center;gap:10px}.balance-name{font-weight:700}.balance-amounts{display:flex;flex-direction:column;align-items:flex-end}.amount.plus{color:var(--plus);font-weight:700}.amount.minus{color:var(--minus);font-weight:700}.neutral{color:var(--text-sub)}.inactive-mark,.me-mark{font-size:.75rem;color:var(--text-sub);font-weight:400}.settlement-right{display:flex;align-items:center;gap:4px;white-space:nowrap}.member-actions{display:flex;gap:2px;white-space:nowrap}.tabbar{position:fixed;bottom:0;left:0;right:0;background:var(--card);border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:6px 0 max(6px,env(safe-area-inset-bottom));max-width:480px;margin:0 auto}.tab{background:none;border:none;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:.75rem;color:var(--text-sub);cursor:pointer;padding:4px 12px;font-family:inherit}.tab.active{color:var(--primary);font-weight:700}.tab-icon{font-size:1.2rem}.error{color:var(--danger);font-size:.9rem;margin:8px 0}.flash{background:#ecfdf5;color:var(--plus);border:1px solid #a7f3d0;border-radius:8px;padding:10px 12px;font-size:.9rem}.empty,.loading,.hint{color:var(--text-sub);font-size:.9rem}.url-box{word-break:break-all;background:var(--bg);border-radius:8px;padding:10px;font-size:.85rem;margin:0 0 10px}