/*Variables Generales*/

:root{
    --color-primary: #28a745;
    --color-bg: #f9f9f9;
     --color-surface: #ffffff;
     --color-text: #222222;
    --color-muted: #666666;
    --color-border: #dddddd;
    --color-primary-rgb: 40,167,69;
    --color-primary-soft: rgba(var(--color-primary-rgb), 0.12);

    --font-base: "Arial", sans-serif;
    --font-heading: "Segoe UI", sans-serif;

    --page-gutter: 16px;     
    --footer-space: 60px; 
}

/*Reset*/

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

html{ min-height: 100%;}

body{
    font-family:var(--font-base);
    background:var(--color-bg);
    color:var(--color-text);
    line-height: 1.6;
    padding: var(--page-gutter);

/* Sticky footer */

    min-height:100vh;
    position:relative;
    padding-bottom:var(--footer-space);
}

h1, h2, h3{
    font-family: var(--font-heading);
    margin: bottom 0.5rem;
}

p{
    margin-bottom: 0.5rem;
    color:var(--color-muted);
}

a:hover{
    text-decoration: underline;
}

/* Escala tipografica */

h1{
    font-size: 1.75rem;
    line-height: 1.2;
}

h2{
    font-size: 1.35rem;
    line-height: 1.3;
}

h3{
    font-size: 1.1rem;
    line-height: 1.35;
}

small, .muted{
    color: var(--color-muted);
}

/* Espaciado entre secciones */

header, nav, main, footer, section{
    margin-bottom: 1.25rem;
}

/* Header */

header{
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
}

header > div{
    display: inline-block;
    vertical-align:middle;
}

/* Logo */

header img{
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-right: 0.75rem;
    vertical-align: middle;
}

/* "Gestion Profesional de Facturas" */

header p{
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--color-muted);
}

/* Boton base */

button{
    background: var(--color-primary);
    color: #fff;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-base);
    margin-right: 8px;
}

button:hover{
    background: #218838;
}

/* Acciones rapidas */

.acciones h2{
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
}

/* Footer final hoja */

footer{
    position:absolute;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: 0.4rem var(--page-gutter);
    color: var(--color-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--color-border);
}