/* ===========================================
   BASE CSS - Reset y Estilos Fundamentales
   =========================================== */

/* --- Reset Moderno --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--background);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Tipografía Base --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
    margin-bottom: var(--spacing-4);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

strong, b {
    font-weight: var(--font-weight-semibold);
}

small {
    font-size: var(--font-size-sm);
}

/* --- Listas --- */
ul, ol {
    padding-left: var(--spacing-6);
    margin-bottom: var(--spacing-4);
}

li {
    margin-bottom: var(--spacing-2);
}

/* --- Código --- */
code, pre {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

code {
    background-color: var(--surface-variant);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
}

pre {
    background-color: var(--surface-variant);
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-4);
}

pre code {
    background: none;
    padding: 0;
}

/* --- Separadores --- */
hr {
    border: none;
    border-top: 1px solid var(--divider);
    margin: var(--spacing-6) 0;
}

/* --- Imágenes --- */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Formularios Base --- */
button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-3) var(--spacing-4);
    background-color: var(--surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* --- Selección de Texto --- */
::selection {
    background-color: var(--primary-light);
    color: var(--primary-dark);
}

/* --- Scrollbar Personalizada --- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-variant);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-disabled);
}

/* --- Utilidades de Accesibilidad --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.focus-visible:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* --- Contenedores --- */
.container {
    width: 100%;
    max-width: var(--max-width-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.container-narrow {
    max-width: var(--max-width-content);
}

/* --- Utilidades de Texto --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-disabled { color: var(--text-disabled); }

.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-info { color: var(--info); }

/* --- Utilidades de Display --- */
.hidden { display: none !important; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* --- Utilidades de Flex --- */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-col {
    flex-direction: column;
}

.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }

/* --- Animaciones --- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-fadeIn {
    animation: fadeIn var(--transition-normal);
}

.animate-slideIn {
    animation: slideIn var(--transition-normal);
}

/* --- Print --- */
@media print {
    body {
        background: white;
        color: black;
    }

    .no-print {
        display: none !important;
    }
}