:root,[data-theme=light]{--bg: #f4f6f8;--text: #1f2933;--text-muted: #52606d;--text-faint: #7b8794;--card: #ffffff;--border: #e4e7eb;--border-strong: #cbd2d9;--row-border: #eef0f3;--ghost: #e4e7eb;--accent: #1992d4;--danger: #e12d39}[data-theme=dark]{--bg: #101418;--text: #e6e9ee;--text-muted: #9aa5b1;--text-faint: #6c7683;--card: #1a2027;--border: #2a323d;--border-strong: #3a4450;--row-border: #242c36;--ghost: #2a323d;--accent: #1992d4;--danger: #e12d39}:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0}.app{max-width:720px;margin:0 auto;padding:24px 16px}.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.header h1{margin:0;font-size:24px}.header-right{display:flex;align-items:center;gap:8px}.logout,.theme-toggle{background:none;border:1px solid var(--border-strong);border-radius:8px;padding:6px 12px;cursor:pointer;color:var(--text-muted)}.tabs{display:flex;gap:8px;margin-bottom:20px}.tabs button{flex:1;padding:10px;border:1px solid var(--border-strong);background:var(--card);border-radius:8px;cursor:pointer;font-size:15px;font-weight:500;color:var(--text)}.tabs button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:16px}.field{margin-bottom:12px}.field label{display:block;font-size:13px;color:var(--text-muted);margin-bottom:4px}.field input{width:100%;padding:8px 10px;border:1px solid var(--border-strong);border-radius:6px;font-size:15px;background:var(--card);color:var(--text)}.row{display:flex;gap:12px}.row .grow{flex:1}.btn{padding:10px 16px;border:none;border-radius:6px;font-size:15px;cursor:pointer;font-weight:500}.btn-primary{background:var(--accent);color:#fff}.btn-danger{background:var(--danger);color:#fff}.btn-ghost{background:var(--ghost);color:var(--text)}.error{color:var(--danger);font-size:14px;margin-bottom:12px}.spend-list{list-style:none;padding:0;margin:0}.spend-item{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--row-border)}.spend-item:last-child{border-bottom:none}.spend-amount{font-weight:600;font-size:16px}.spend-comment{color:var(--text-muted);font-size:14px}.spend-date{color:var(--text-faint);font-size:13px}.spend-actions button{margin-left:8px;font-size:13px;padding:4px 8px}.login{max-width:380px;margin:80px auto;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:28px;text-align:center}.login h1{margin-top:0}.summary-card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:16px;text-align:center}.summary-total{font-size:32px;font-weight:700;color:var(--accent)}.summary-avg{font-size:14px;color:var(--text-faint);margin-top:4px;margin-bottom:16px}.btn-ai{background:var(--accent);color:#fff;display:inline-block}.btn-ai:disabled{opacity:.6;cursor:not-allowed}.ai-blocked{margin-top:12px;font-size:13px;color:var(--danger, #e5484d)}.ai-cost{font-size:13px;color:var(--text-faint);margin-top:12px;margin-bottom:16px}.ai-error{margin-top:12px}.ai-result{text-align:left;margin-top:16px;border-top:1px solid var(--border);padding-top:16px}.ai-notice{font-size:15px;font-weight:600;margin-bottom:4px}.ai-month{font-size:13px;color:var(--text-faint);margin-bottom:16px}.ai-category{margin-bottom:16px}.ai-category-name{font-weight:600;font-size:15px;margin-bottom:6px;color:var(--text)}.ai-spends{list-style:none;padding:0;margin:0}.ai-spend{display:flex;justify-content:space-between;gap:12px;padding:4px 0;font-size:14px}.ai-amount{font-weight:600;white-space:nowrap}