:root{--primary: #3b82f6;--bg: #f8fafc;--card: #ffffff;--border: #e2e8f0}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:#0f172a}.app{max-width:480px;margin:0 auto;min-height:100vh;padding-bottom:72px}.content{padding:16px}.page{display:flex;flex-direction:column;gap:16px}.page-header{display:flex;justify-content:space-between;align-items:center}h1{font-size:1.25rem;margin:0}.balance-card{background:var(--primary);color:#fff;border-radius:16px;padding:24px;text-align:center}.balance-amount{font-size:2rem;font-weight:700;margin:0}.balance-message{margin:8px 0 0;font-size:.9rem}.badge{display:inline-block;margin-top:8px;background:#fff;color:var(--primary);padding:2px 10px;border-radius:999px;font-size:.75rem}.summary,.expense-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px}.expense-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:8px}.expense-item{display:flex;justify-content:space-between;align-items:center}.expense-item div{display:flex;flex-direction:column;gap:2px;cursor:pointer}.form label{display:flex;flex-direction:column;gap:4px;font-size:.85rem}.form input,.form select{padding:10px;border:1px solid var(--border);border-radius:8px;font-size:1rem}fieldset{border:1px solid var(--border);border-radius:8px}button{padding:10px 16px;border:1px solid var(--border);border-radius:8px;background:#fff;font-size:.9rem}button.primary{background:var(--primary);color:#fff;border:none;font-weight:600;padding:14px}.error{color:#dc2626}.info{color:#16a34a}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;background:#fff;border-top:1px solid var(--border);display:flex;justify-content:space-around;align-items:center;padding:8px 0}.bottom-nav a{text-decoration:none;color:#64748b;font-size:.75rem}.bottom-nav a.active{color:var(--primary);font-weight:600}.bottom-nav a.fab{background:var(--primary);color:#fff;width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-top:-24px}