/* ========== VARIABLES CSS ========== */
:root {
    /* Colores neutros */
    --color-bg: #f0f2f5;
    --color-surface: #ffffff;
    --color-surface-hover: #f5f6f8;
    --color-border: #e0e0e0;
    --color-border-light: #f0f0f0;
    
    /* Texto */
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    
    /* Acentos neutros */
    --color-accent: #0088cc;
    --color-accent-hover: #0077b3;
    --color-user-message: #e3f2fd;
    --color-ai-message: #ffffff;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);
    
    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    
    /* Bordes */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 50%;
    
    /* Dimensiones */
    --header-height: 60px;
    --footer-height: auto;
    --max-content-width: 100%;
}

/* ========== RESET Y BASE ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    overflow: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

textarea {
    font-family: inherit;
    resize: none;
}

/* ========== SCROLLBAR PERSONALIZADA ========== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #999;
}