:root{--bg: #f6f5f1;--surface: #ffffff;--ink: #1e1c18;--muted: #7a7568;--accent: #2f6b4f;--accent-ink: #ffffff;--border: #e4e1d7;--danger: #b23b3b;--radius: 12px;font-family:-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}.shell{max-width:480px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column}.topbar{padding:16px 20px;border-bottom:1px solid var(--border)}.brand{font-weight:600;font-size:18px;color:var(--accent);text-decoration:none}main{padding:20px;flex:1}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}h1{font-size:20px;margin:0 0 4px}.muted{color:var(--muted);font-size:14px}.field{display:flex;flex-direction:column;gap:6px;margin:16px 0;font-size:14px;font-weight:500}input{border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:15px;background:var(--surface);color:var(--ink)}input:focus{outline:2px solid var(--accent);outline-offset:1px}button{width:100%;padding:12px;border-radius:8px;border:none;background:var(--accent);color:var(--accent-ink);font-size:15px;font-weight:600;cursor:pointer;margin-top:12px}button:disabled{opacity:.6;cursor:default}button.ghost{background:transparent;color:var(--accent);border:1px solid var(--border);font-weight:500}.error{color:var(--danger);font-size:14px}.items-list{display:flex;flex-direction:column;gap:8px;margin:16px 0}.item-row{display:flex;align-items:center;gap:8px}.item-row input[type=text],.item-row input:not([type]){flex:1}.item-row input[type=number]{width:90px}.select-row{justify-content:space-between;border-bottom:1px solid var(--border);padding-bottom:8px}.item-name{display:flex;flex-direction:column;gap:2px;font-weight:500}.select-row input[type=number]{width:64px;text-align:right}.tax-row{display:flex;gap:16px}.tax-row .field{flex:1}.result-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--border)}