:root{--lemon-yellow:#ffe135;--lemon-dark:#e6c200;--lemon-light:#fff8d6;--charcoal:#333;--gray-light:#f5f5f5;--gray-medium:#888;--success-green:#22c55e;--white:#fff;--shadow:0 2px 8px #0000001a;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--lemon-light);color:var(--charcoal);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5}h1{font-size:24px;font-weight:700}h2{font-size:20px;font-weight:600}h3{font-size:18px;font-weight:600}button{cursor:pointer;border-radius:var(--radius);border:none;min-height:56px;padding:16px 24px;font-family:inherit;font-size:18px;font-weight:600;transition:all .2s}.btn-primary{background:var(--lemon-yellow);color:var(--charcoal);width:100%}.btn-primary:hover:not(:disabled){background:var(--lemon-dark)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--white);color:var(--charcoal);border:2px solid var(--lemon-yellow)}.btn-secondary.ready{background:var(--success-green);color:var(--white);border-color:var(--success-green);animation:1.5s infinite pulse}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}.btn-logout{color:var(--charcoal);background:0 0;min-height:auto;padding:8px 16px;font-size:14px}.login-container{justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.login-card{background:var(--white);border-radius:var(--radius);width:100%;max-width:400px;box-shadow:var(--shadow);padding:32px 24px}.login-header{text-align:center;margin-bottom:32px}.login-header .logo{margin-bottom:8px;font-size:48px;display:block}.login-header h1{margin-bottom:4px}.login-header p{color:var(--gray-medium)}.login-form{flex-direction:column;gap:16px;display:flex}.form-group{flex-direction:column;gap:6px;display:flex}.form-group label{font-size:14px;font-weight:500}.form-group input{border:2px solid var(--gray-light);border-radius:var(--radius);padding:14px 16px;font-size:16px;transition:border-color .2s}.form-group input:focus{border-color:var(--lemon-yellow);outline:none}.home-container{flex-direction:column;min-height:100vh;display:flex}.app-header{background:var(--white);box-shadow:var(--shadow);z-index:100;justify-content:space-between;align-items:center;padding:16px;display:flex;position:sticky;top:0}.header-left{align-items:center;gap:8px;display:flex}.header-left .logo{font-size:28px}.app-title{font-size:18px;font-weight:700}.main-content{flex-direction:column;flex:1;padding:24px;display:flex}.welcome-text{text-align:center;color:var(--gray-medium);margin-bottom:32px;font-size:14px}.phone-lookup{flex-direction:column;gap:16px;display:flex}.phone-label{text-align:center;font-size:20px;font-weight:600}.phone-input{text-align:center;border:2px solid var(--gray-light);border-radius:var(--radius);background:var(--white);letter-spacing:2px;padding:20px;font-size:24px}.phone-input:focus{border-color:var(--lemon-yellow);outline:none}.customer-container{flex-direction:column;min-height:100vh;padding-bottom:100px;display:flex}.page-header{background:var(--white);box-shadow:var(--shadow);z-index:100;justify-content:space-between;align-items:center;padding:16px;display:flex;position:sticky;top:0}.back-link{color:var(--charcoal);font-weight:500;text-decoration:none}.customer-phone{letter-spacing:1px;font-weight:700}.customer-content{flex-direction:column;flex:1;gap:24px;padding:24px;display:flex}.customer-name{text-align:center}.stamp-card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.stamp-grid{grid-template-columns:repeat(5,1fr);gap:8px;margin-bottom:16px;display:grid}.stamp-slot{aspect-ratio:1;background:var(--gray-light);border-radius:50%;justify-content:center;align-items:center;font-size:32px;display:flex}.stamp-slot.filled{background:var(--lemon-light)}.stamp-slot.empty{color:var(--gray-medium);font-size:24px}.stamp-progress{text-align:center;flex-direction:column;gap:4px;display:flex}.stamp-count{font-size:24px;font-weight:700}.stamps-needed{color:var(--gray-medium);font-size:14px}.ready-badge{color:var(--success-green);font-size:16px;font-weight:600}.customer-stats{gap:16px;display:flex}.stat{background:var(--white);border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);flex:1;padding:16px}.stat-value{color:var(--lemon-dark);font-size:28px;font-weight:700;display:block}.stat-label{color:var(--gray-medium);text-transform:uppercase;letter-spacing:.5px;font-size:12px}.transaction-list{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.transaction-list h3{margin-bottom:12px}.transaction-list ul{list-style:none}.transaction-item{border-bottom:1px solid var(--gray-light);align-items:center;gap:12px;padding:12px 0;display:flex}.transaction-item:last-child{border-bottom:none}.tx-icon{font-size:24px}.tx-details{flex-direction:column;flex:1;display:flex}.tx-description{font-weight:500}.tx-date{color:var(--gray-medium);font-size:12px}.transaction-list.empty{text-align:center;color:var(--gray-medium);padding:32px}.action-footer{background:var(--white);padding:16px;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -2px 8px #0000001a}.action-buttons{gap:12px;display:flex}.action-buttons button{flex:1}.btn-purchase{flex:1.2!important}.error-message{color:#dc2626;border-radius:var(--radius);text-align:center;background:#fee2e2;margin:24px;padding:16px}@media (min-width:640px){.login-card{padding:48px 40px}.main-content,.customer-content{width:100%;max-width:500px;margin:0 auto}.stamp-slot{font-size:40px}.action-footer{max-width:500px;left:50%;transform:translate(-50%)}}.editable-name{cursor:pointer;border-radius:var(--radius);justify-content:center;align-items:center;gap:8px;padding:8px;transition:background .2s;display:flex}.editable-name:hover{background:#ffe13533}.editable-name .edit-icon{opacity:.5;font-size:14px}.editable-name:hover .edit-icon{opacity:1}.editable-name.editing{cursor:default;flex-direction:column}.editable-name.editing:hover{background:0 0}.placeholder-name{color:var(--gray-medium);font-style:italic;font-weight:400}.name-input{text-align:center;border:2px solid var(--lemon-yellow);border-radius:var(--radius);background:var(--white);width:100%;max-width:300px;padding:12px 16px;font-size:18px}.name-input:focus{border-color:var(--lemon-dark);outline:none}.name-actions{gap:8px;margin-top:8px;display:flex}.btn-save,.btn-cancel{border-radius:8px;min-height:auto;padding:8px 16px;font-size:14px}.btn-save{background:var(--success-green);color:var(--white)}.btn-save:hover:not(:disabled){background:#1da34d}.btn-cancel{background:var(--gray-light);color:var(--charcoal)}.btn-cancel:hover:not(:disabled){background:#e0e0e0}.page-title{text-align:center;margin-bottom:24px;font-size:22px}.customer-list{flex-direction:column;gap:12px;display:flex}.customer-card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);color:inherit;justify-content:space-between;align-items:center;padding:16px;text-decoration:none;transition:transform .2s,box-shadow .2s;display:flex}.customer-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.customer-info{flex-direction:column;gap:4px;display:flex}.customer-card-name{font-size:16px;font-weight:600}.customer-card-phone{color:var(--gray-medium);letter-spacing:1px;font-size:14px}.customer-card-stats{flex-direction:column;align-items:flex-end;gap:4px;display:flex}.stamp-badge{background:var(--lemon-light);border-radius:16px;padding:4px 10px;font-size:14px;font-weight:600}.purchase-count{color:var(--gray-medium);font-size:12px}.empty-state{text-align:center;color:var(--gray-medium);padding:48px 24px}.view-customers-link{text-align:center;background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--charcoal);margin-top:32px;padding:16px;font-weight:500;text-decoration:none;transition:transform .2s,box-shadow .2s;display:block}.view-customers-link:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}