* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4CAF50;
    --primary-dark: #388E3C;
    --secondary: #FF9800;
    --danger: #f44336;
    --success: #4CAF50;
    --warning: #FFC107;
    --dark: #333;
    --gray: #666;
    --light-gray: #f5f5f5;
    --white: #fff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 16px;
}

.app {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
header {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 16px 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo .emoji {
    font-size: 32px;
}

.logo h1 {
    font-size: 20px;
    color: var(--primary);
}

.data-hora {
    font-size: 12px;
    color: var(--gray);
    background: var(--light-gray);
    padding: 6px 12px;
    border-radius: 20px;
}

.status-offline {
    margin-top: 10px;
    padding: 8px;
    background: #ff9800;
    color: white;
    border-radius: 8px;
    text-align: center;
    font-size: 12px;
}

/* Menu de Navegação */
.nav-menu {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    background: var(--white);
    padding: 8px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.nav-btn {
    flex: 1;
    padding: 12px 8px;
    border: none;
    background: var(--light-gray);
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.nav-btn span:first-child {
    font-size: 24px;
}

.nav-btn.active {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    animation: fadeIn 0.3s ease;
}

.card h2 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Cards de Estatísticas */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.stat-card {
    background: linear-gradient(135deg, var(--white) 0%, var(--light-gray) 100%);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-card .emoji {
    font-size: 40px;
    margin-bottom: 8px;
}

.stat-card .valor {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary);
    margin: 8px 0;
}

.stat-card .label {
    font-size: 12px;
    color: var(--gray);
}

/* Tabelas */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

th {
    background: var(--light-gray);
    font-weight: 600;
    color: var(--dark);
}

tr:hover {
    background: var(--light-gray);
}

/* Formulários */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--light-gray);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Botões */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: scale(1.02);
}

.btn-warning {
    background: var(--warning);
    color: var(--dark);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

/* Carrinho de Vendas */
.carrinho-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--light-gray);
    border-radius: 12px;
    margin-bottom: 8px;
}

.carrinho-item-info {
    flex: 1;
}

.carrinho-item-nome {
    font-weight: 600;
}

.carrinho-item-preco {
    font-size: 12px;
    color: var(--gray);
}

.carrinho-item-remove {
    background: var(--danger);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s;
}

.total-carrinho {
    text-align: right;
    font-size: 20px;
    font-weight: bold;
    padding: 16px;
    border-top: 2px solid var(--light-gray);
    margin-top: 16px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 24px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-size: 20px;
    color: var(--primary);
}

.close-modal {
    font-size: 28px;
    cursor: pointer;
    color: var(--gray);
}

/* Alertas */
.alerta {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 12px;
    color: white;
    animation: slideIn 0.3s ease;
    z-index: 1001;
    font-weight: 500;
}

.alerta-sucesso {
    background: var(--success);
}

.alerta-erro {
    background: var(--danger);
}

/* Banner de Instalação PWA */
.install-banner {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    background: var(--dark);
    color: white;
    padding: 16px;
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.install-banner button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
}

/* Animações */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsividade */
@media (max-width: 768px) {
    body {
        padding: 8px;
    }
    
    .nav-btn span:last-child {
        display: none;
    }
    
    .nav-btn span:first-child {
        font-size: 28px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    th, td {
        padding: 8px;
        font-size: 12px;
    }
    
    .btn {
        padding: 10px 16px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}